Introduction to Cavity QED
|
|
- Jocelyn Casey
- 6 years ago
- Views:
Transcription
1 Introduction to Cavity QED Fabian Grusdt March 9, 2011 Abstract This text arose in the course of the Hauptseminar Experimentelle Quantenoptik in WS 2010 at the TU Kaiserslautern, organized by Prof. Ott and Prof. Widera. I want to give a short introduction - also from the theoretical point of view - to the fascinating field of cavity quantum electrodynamics (CQED). Modern experiments (QND measurements on photons and photon blockade) are discussed and basic results derived. Contents I. Introduction 1 II. The Jaynes-Cummings Model 1 III. Strong- and Weak- coupling regime 2 IV. Basic experimental techniques 2 First proofs of strong coupling Atom traps inside cavities V. QND measurements on single photons 3 VI. Photon blockade 5 Photon blockade experiment VII. Acknowledgements 7 interacting with a single electromagnetic field mode. This setup is shown in figure 1. The total Hamiltonian is given by where H = H field + H atom + H int, (1) H field = ω C â â (2) describes the longitudinal quasi-mode in the cavity and H atom = ω Aˆσ eg ˆσ ge (3) the non-interacting two-level atom. The spin-flip operators are defined as ˆσ ge = g e. The operators â, â are given by the decomposition of our singlemode field 1 I. Introduction Cavity QED investigates the interaction of single atoms with single electromagnetic field modes. To achieve the experimental goal of realizing such a system, effort was made and nowadays it is achievable even for optical transitions. This paves the way for many interesting physical applications. Two of the most interesting ones are for sure the use of cavity QED for the construction of a quantum network (with the aim to use it for quantum computational tasks) and on the other hand its usefulness for elementary verifications of quantum mechanics. II. The Jaynes-Cummings Model In this section we want to introduce the important Jaynes-Cummings Hamiltonian describing a two-level atom (consisting of states g, e separated by ω A ) Ê = E sin(kx)(â + â ), E = ωc 2ɛ 0 V. (4) Using this quantity one obtains the interaction energy in the dipole approximation H int = ˆd Ê = E sin(kx)(ˆσ eg + ˆσ ge )(â + â ) RWA = g (âˆσ eg + â ˆσ ge ), where in the last step the rotating wave approximation (RWA) was made. The coupling constant g is called single-photon Rabi frequency and given by g = E sin(kx), = e eˆ r g (5) The Hamiltonian (1) in the rotating wave approximation (RWA) is then called Jaynes-Cummings- Hamiltonian, and it is analytically solvable. That can easily be seen when restricting ourselves on the invariant subspace N = { n + 1 g, n e }: HN N, (6) 1 We have chosen our x-axis in such a way that there is a standing-wave node at x = 0, thus the sine appears in the decomposition. 1
2 g y x e ω A g ω C Γ κ Figure 1: The cavity QED parameters. i.e. H is block-diagonal. Exact diagonalization of the 2 2 blocks yields the eigenstates (dressed-states [15]): with +, n = sin θ n n e + cos θ n n + 1 g,, n = cos θ n n e sin θ n n + 1 g cos θ n = Ωn δ Ωn + δ, sin θ n =, 2Ω n 2Ω n Ω n = 4g 2 (n + 1) + δ 2, δ = ω A ω C. main goals of modern experiments is to trap single atoms long enough to perform quantum-logical operations with them [3,4]. But there is also a second, reverse way of using cavity QED, where the field in high-q cavities itself is measured via beams of Rydberg atoms[1]. These experiments (and also their methods) will be discussed in the following chapter. First proofs of strong coupling The eigenenergies of these dressed states are E ±,n = 1 2 ω A + (n + 1) ω C ± 1 2 Ω n. (7) They are compared to the case of vanishing coupling g = 0 in figure 2. III. Strong- and Weak- coupling regime The Jaynes-Cummings Hamiltonian does not include any coupling to an environment leading to decay. In order to include the two loss-mechanisms, namely spontaneous decay into the vacuum modes from e (rate Γ) and decay of the field mode 2 (rate κ), one has to use a master equation(see e.g. [5]). It should - by physical understanding - be clear that large losses, i.e. Γ, κ g lead to strong decay and thus no coherent evolution is expected. This case is referred to as weak coupling regime. In the opposite case Γ, κ g coherent evolution dominates for a very long time, until dephasing destroys it. This case is referred to as strong coupling regime. After some analysis [5] it turns out that the cavity coupling leads to a modified decay rate of the atom. Both extreme cases can be found, that of enhanced and that of inhibited spontaneous decay. IV. Basic experimental techniques In this section I want to discuss the basic experimental techniques employed in cavity QED. One of the 2 In the experiment this decay is usually caused by mirror imperfections. The first aim when dealing with cavity QED was to proof operation in the strong coupling regime. Therefore it was tried to measure the single-atom vacuum Rabi splitting. A basic problem in the first experiments was that one couldn t trap atoms in cavities but only beams of atoms where available. The first experiment [7] that measured single atom transits shall be presented in the following. The experimental setup is shown in figure 3 (a): The cold atoms are provided by a Cesium-MOT some millimeters above the cavity. At the beginning of each measurement the MOT is released and the atoms can escape. Some of them then pass through the cavity and interact with the field. The energy levels themselves are recorded via the transmission of a probe beam incident on the cavity: The transmittance is high when the probe laser is on resonance with a cavity mode. When an atom enters, it acts like a dispersive medium and thus the mode energies are effectively shifted. The shift is given by the vacuum Rabi splitting g (provided there are no (e.g. thermal) photons inside the cavity, which is very unlikely for optical frequencies). In order to make sure that only a single atom is inside the cavity at a time, a second probe laser is used to monitor the transit of single atoms. Therefore the second probe laser is held at zero detuning (relative to ω C ). When an atom enters, the transmittance of this second laser decreases dramatically and the presence of a single atom is shown. 2
3 2 g 1 e 1 g 0 e ω C = ω A +, 1, 1 +, 0, 0 2g g 0 g ω C = ω A 0 Figure 2: The Jaynes-Cummings energy levels for zero detuning δ = 0. Left: g = 0, right: g 0. (a) (b) Figure 3: Experimental setup (a) and single atom vacuum Rabi splitting (b) as main result of [7]. measurement in explained in the text below. The Atom traps inside cavities It is very desirable to trap a single atom for a long time inside an optical cavity. There exist proposals how one can then couple many such cavity-atom systems to implement quantum networks [3], or how to perform quantum computation with the neutral atom ground states as qubits [4]. For trapping single atoms dipole traps are standard. In order to not disturb the cavity mode used for the CQED setup one uses far off-resonance traps (FORTs). The needed additional laser beam can be coupled into a TEM 00 cavity mode besides a standard probe beam for example. The central experimental problem is the finite trapping time of the atom. It is limited by several heating mechanisms (discussed e.g. in [8,9,10]). Additionally the two levels needed e and g experience different AC-Stark shifts, dephasing the coherent evolution of the system. However the mentioned problems could be solved by using a specific trapping wavelength called magic wavelength. It depends on the sort of atoms used. In [10] a trapping mechanism based on the magic wavelength λ Cs = 935 nm for Cesium is reported where the authors reach an atomic trapping time of 2 3s. V. QND measurements on single photons The group of Haroche at ENS in Paris succeeded in performing non-destructive measurements on single photons trapped inside a high-q cavity [1,2] where the photon is not lost in the process. These processes are expected to be described by the quantum mechanical postulates of measurements. They used the dispersive interaction of single atoms with the trapped intra-cavity-photons in the strong coupling regime to perform a measurement on the field via atoms. Therefore they need atomic states with a long enough lifetime for the detection, provided by circular Rydberg atoms. These are atoms in states with a high principle quantum number n (n = 50 in the experiment) and the highest possible angular and magnetic quantum numbers: l = n 1 m l = n 1 (8) These states have radiative lifetimes of about a factor 1000 larger than their corresponding low-l states, and in the experiment they were of the order τ = 30 ms. The atomic transition used (n = 50 n = 51) is in the microwave regime and thus a microwave cavity is used. It is constructed of superconducting niobium mirrors (separated 27 mm apart from each other) and reaches a photon storage time T 0.13 s. Together 3
4 Figure 4: The setup of the experiment described in the text, [1,2]. e δ ω C g C R 1 R 2 D π 2 Φ π 2 Figure 5: The working principle of the Ramsey interferometer used to measure the state of the intra-cavity field. with the cavity resonance used at ω C /2π = 51.1 GHz this yields a Q-value 3 of Q In order to avoid thermal radiation the whole setup us cooled down to 0.8 K. The maximal coupling strength is given by g 0 /2π = 51 khz while the detuning between cavity resonance and atomic transition is δ/2π = 67 khz. Thus δ g 0 which is required for the Ramsey interferometer that shall be discussed now. In order to detect the coherent atom-light interaction, the high-q cavity C is sandwiched by two additional cavities (R 1, R 2 ) forming an atomic Ramsey interferometer, see figure 4. Its working principle is shown figure 5. Atoms optically pumped into g are prepared in a superposition state by applying a π/2-pulse in R 1. They fly through the cavity where they interact with the field-mode. In their first QND experiment [1] the Paris group considered only field states 5 of at maximum one photon: Ψ field = c c 1 1. (9) The atom-cavity interaction can be understood as an adiabatic following of the Jaynes-Cummings states and when properly adjusted the result is the following: n = 0 Φ = π n = 1 Φ = 2π where Φ stands for the rotation angle of the atomic state vector around the Bloch-sphere z-axis. This result is obtained assuming adiabatic following of the atomic states when passing C. The adiabaticity condition then gives the restriction mentioned above, δ g 0. After this process another classical π/2- pulse is applied in R 2, leading to the final atomic states Ψ atom : n = 0 Ψ atom = g n = 1 Ψ atom = e. The state-sensitive detectors D 1 and D 2 can thus (indirectly) measure the state of the intra-cavity field. To be precise, they only measure whether the photon number is odd or even since within the experimental errors 0 and 2 photon states yield the same probability for detecting the atom in e. In [2] the experimental setup was then refined such that up to n = 7-photon-states can be subsequently measured in the same way. In this case, of course, several atoms are needed to gain complete information about the field-state. After having understood how the measurement works we will now discuss some of the results. The main goal of the experiment was to confirm the quantum mechanical postulates. In [1] two kinds of experiments 3 The Q-value is used to characterize the quality of a cavity. It is defined as Q = ω C κ. 4 This is the highest Q-value ever achieved with a cavity so far. 5 The atomic states are not to be mistaken for the field states. Here n, for n an integer, denotes field states while e, g denote the atomic ones. 4
5 (A) (B) Figure 6: (A) Birth and death of thermal intra-cavity photons observed with the method explained in the text. (B) Loss of one prepared intra-cavity photon (upper case) and average over 904 such measurements (lower case). All from [1]. were performed on the field subspace consisting of 0 and 1. In the first, thermal photons were continuously observed, an example is shown in figure 6 (A). One can clearly distinguish between the one photon state and vacuum although there are several unexpected events caused by experimental imperfections. In the second experiment the field state 1 was prepared in a controlled way by sending through the cavity an atom in e. Its interaction time inside the cavity was adjusted such that the atom exits the cavity in g and a photon is left in the cavity field. Afterwards the decay of these photons is observed like before, see figure 6 (B). In the upper diagram a single measurement is shown while in the lower the average over 904 such single ones was calculated. The expected quantum-jump behavior for single events as well as the smooth exponential decay of the ensembleaverage can clearly be seen. VI. Photon blockade In this last section we will discuss how one can utilize cavity QED for strong photon-photon interactions. These can be used to create non-classical states of light. I will present an experiment [12] based on a theoretical proposal [11] for creating such states. Photon blockade experiment The experiment reported here [12] was performed at the CALTECH in 2005 by Birnbaum et. al. The basic idea was to use the Jaynes-Cummings anharmonicity of a single trapped atom in a high-q optical cavity to reach strong enough photon-photon interaction. If 6 For details about photon statistics the reader is referred to e.g. [5]. these interactions are large enough (i.e. if the additional energy needed to place a second photon into the cavity besides ω C is large enough) only one or no photon can populate the cavity mode due to energy conservation. This phenomenon is referred to as photon blockade. The required large non-linearity is achieved here by strong atom-field coupling, i.e. large g. Photon blockade can be observed by examination of the photon statistics 6 of light transmitted trough the cavity mirrors: sub-poissonian and anti-bunched light is expected. The experimental parameters are: (g max, Γ, κ) /2π = (34, 2.6, 4.1)MHz. (10) Thus the setup is far in the strong coupling regime. The photon-photon interaction for a two-level system can be deduced from figure 2. We assume a pumpbeam with photon energy ω 0 = E,0 E 0 and zero detuning δ = 0 between cavity-mode and atomic transition. Thus 0, can be populated. If an additional photon shall populate the cavity, the lowest possible energy state is 1,. This yields an estimate for the photon-photon interaction energy γ E,1 2 ω 0 = (2 2)g 20MHz 2π, which is large compared to the typical line width which is of the order κ. From the latter it is clear that photon-photon interactions give a substantial contribution. The assumption of one cavity mode and a simple two-level system however is not justified for a realistic system. In the actual experiment two orthogonally polarized cavity modes l y,z are present and atomic cesium was used. The atomic transition is the Cs D2-line 6S 1/2, F = 4 6P 3/2, F = 5 and the manifold of hyperfine sub-levels has to be taken into 5
6 Figure 7: Energy levels of the full hyperfine-manifold dressed states of the Cs D2-line. ω 0 ω C = ω A was assumed. From [12]. (a) (b) Figure 8: (a) Experimental setup. (b) Theoretical calculation (steady-state solution to the full master equation) for a two-level system (left) and the actual Cs D2-transition manifold in the experiment. Both from [12]. (a) (b) Figure 9: (Measurement result around τ = 0, (a), and on longer time scales (b). Both from [12]. 6
7 account. Exact diagonalization of the corresponding Hamiltonian yields the dressed-states energy levels given in figure 7. The photon-photon interaction is still of the order of γ calculated for the two-level model above. Next, the experimental setup (see figure 8 (a)) shall be discussed. A probe beam E p (y,z) incident on mirror M 1, polarized in y- or z-direction respectively, drives the cavity. Inside the latter a single Cs-atom is trapped in a FORT and there are further laser beams for cooling and testing (for details, see [12]). Behind the second mirror M 2 only the z-polarized light can pass the polarizing beam splitter PBS. Then g (2) (τ) of the transmitted field Et z is measured via coincidences of D1 and D 7 2. For this setup the steady-state solution of the full master-equation is shown in figure 8 (b), once for the simple two-level model and for the actual Cs-atom. In the latter case T zz (T yz ) refers to the transmittance of light from l z (l y ) 8 into l z and analogously g zz (2) (g yz (2) ) refers to the second-order correlation function of the transmitted l z -light for incident l z (l y ) light. One sees that the realistic system qualitatively behaves like the two-level system. The transmittance has just got more structures around the vacuum-rabi peaks due to the additional states. The correlation functions can at least partly be understood. Around ω p ω 0 = g max g 0 all plots exhibit sub-poissonian statistics. This can most clearly be seen at g yz (2) (τ). These statistics can be understood as a direct consequence of photon-blockade: Only one photon at a time can populate the cavity-mode. So we also expect photon anti-bunching for this frequency. One also clearly sees peaks at about ω p = ω 0 ±g 0 / 2, at two-photon resonance. Here the field shows superpoissonian statistics g (2) (0) 1. For more details, [1 ] Sébastien Gleyzes, Stefan Kuhr, Christine Guerlin, Julien Bernu, Samuel Deléglise, Ulrich Busk Hoff, Michel Brune, Jean-Michel Raimond, Serge Haroche, Nature 446, (2007) [2 ] Christine Guerlin, Julien Bernu, Samuel Deléglise, Clément Sayrin, Sébastien Gleyzes, Stefan Kuhr, Michel Brune, Jean-Michel Raimond, Serge Haroche, Nature 448, (2007) [3 ] T. Pellizzari, S.A. Gardiner, J.I. Cirac, P. Zoller, Phys.Rev.Lett. 75, 3788 (1995) see literature given in [12]. The aim of the experiment was to measure subpoissonian statistics and photon anti-bunching for the light emitted from the cavity. The theoretical calculations (figure 8 (b)) suggest measuring g yz (2) (τ) at ω p = ω 0 ±g 0. Here we expect the most significant signal. Measuring at this ω p has the additional benefit that motional effects of the trapped atom are suppressed. Such motion causes the coupling g to decrease, and thus the transmittance T yz (ω 0 g 0 ) also decreases. This yields a smaller contribution to the total counts. In figure 9 the measurement result is shown. Around τ = 0 (see (a)) one clearly sees photon-anti-bunching and sub-poissonian statistics. One finds: g (2) yz (0) = 0.13 ± 0.11 < 1 (11) and the field is clearly non-classical here. The width of the dip ( τ = 45ns) at τ = 0 is consistent with the lifetime of 0, given by τ = 2/(Γ + κ) = 48ns. In (b) the same curve but over longer timescales is shown. One recognizes a periodic modulation that can be explained by atomic motion in the FORT potential. The authors in [12] used this modulation to gain more insight into the trapping mechanisms (for more details, see [12]). VII. Acknowledgements I thank all the participants of the seminar for many nice talks and discussions, and our professors H. Ott and A. Widera for the organization. I am also thankful for the help preparing my talk by Prof. Widera. [5 ] P. Meystre, M. Sargent III: Elements of Quantum Optics, 4th Edition, Springer (2007) [6 ] R Miller, T E Northup, K M Birnbaum, A Boca, A D Boozer, H J KimbleJ. Phys. B: At. Mol. Opt. Phys. 38, 551 (2005) [7 ] C.J. Hood et. al, Phys. Rev. Lett. 80, 4157 (1998) [8 ] J. Ye et. al, Phys.Rev.Lett.83, 4987 (1999) [9 ] T. A. Savard, K. M. O Hara, J. E. Thomas, Phys. Rev. A 56, R1095 (1997) [4 ] J. I. Cirac, P. Zoller, H. J. Kimble, and H. Mabuchi, Phys.Rev.Lett. 78, 3221 (1997) [10 ] J. McKeever et. al, Phys.Rev.Lett. 90, (2003) 7 These coincidences yield g (2) directly because the beamsplitter BS forces two-photon packets to split up and leave in distinct paths, see [5]. 8 l α stands for linear polarized light in α-direction. 7
8 [11 ] A. Imamoglu, H. Schmidt, G. Woods, and M. Deutsch, Phys.Rev.Lett. 79, 1467 (1997) [12 ] K.M. Birnbaum, A. Boca, R. Miller, A.D. Boozer, T.E. Northup, H.J. Kimble, Nature 436, (2005) [13 ] M. Fleischhauer, A. Imamoglu, J.P. Marangos, Rev.Mod.Phys 77, 633 (2005) [14 ] Boca A, Miller R, Birnbaum K M, Boozer A D, McKeever J and Kimble H J, Phys. Rev. Lett. 93, (2004) [15 ] C.N. Cohen-Tannoudji, Nobel Lecture, December 8,
Single Photon Nonlinear Optics with Cavity enhanced Quantum Electrodynamics
Single Photon Nonlinear Optics with Cavity enhanced Quantum Electrodynamics Xiaozhen Xu Optical Science and Engineering University of New Mexico Albuquerque, NM 87131 xzxu@unm.edu We consider the nonlinearity
More informationExploring the quantum dynamics of atoms and photons in cavities. Serge Haroche, ENS and Collège de France, Paris
Exploring the quantum dynamics of atoms and photons in cavities Serge Haroche, ENS and Collège de France, Paris Experiments in which single atoms and photons are manipulated in high Q cavities are modern
More informationOpen Quantum Systems
Open Quantum Systems Basics of Cavity QED There are two competing rates: the atom in the excited state coherently emitting a photon into the cavity and the atom emitting incoherently in free space Basics
More informationDoing Atomic Physics with Electrical Circuits: Strong Coupling Cavity QED
Doing Atomic Physics with Electrical Circuits: Strong Coupling Cavity QED Ren-Shou Huang, Alexandre Blais, Andreas Wallraff, David Schuster, Sameer Kumar, Luigi Frunzio, Hannes Majer, Steven Girvin, Robert
More informationLecture 2: Quantum measurement, Schrödinger cat and decoherence
Lecture 2: Quantum measurement, Schrödinger cat and decoherence 5 1. The Schrödinger cat 6 Quantum description of a meter: the "Schrödinger cat" problem One encloses in a box a cat whose fate is linked
More information10.5 Circuit quantum electrodynamics
AS-Chap. 10-1 10.5 Circuit quantum electrodynamics AS-Chap. 10-2 Analogy to quantum optics Superconducting quantum circuits (SQC) Nonlinear circuits Qubits, multilevel systems Linear circuits Waveguides,
More informationSolid State Physics IV -Part II : Macroscopic Quantum Phenomena
Solid State Physics IV -Part II : Macroscopic Quantum Phenomena Koji Usami (Dated: January 6, 015) In this final lecture we study the Jaynes-Cummings model in which an atom (a two level system) is coupled
More informationThe Nobel Prize in Physics 2012
The Nobel Prize in Physics 2012 Serge Haroche Collège de France and École Normale Supérieure, Paris, France David J. Wineland National Institute of Standards and Technology (NIST) and University of Colorado
More informationIntroduction to Cavity QED: fundamental tests and application to quantum information Serge Haroche July 2004
Introduction to Cavity QED: fundamental tests and application to quantum information Serge Haroche July 2004 A very active research field: Code information in simple systems (atoms, photons..) and use
More information9 Atomic Coherence in Three-Level Atoms
9 Atomic Coherence in Three-Level Atoms 9.1 Coherent trapping - dark states In multi-level systems coherent superpositions between different states (atomic coherence) may lead to dramatic changes of light
More informationCavity QED: Quantum Control with Single Atoms and Single Photons. Scott Parkins 17 April 2008
Cavity QED: Quantum Control with Single Atoms and Single Photons Scott Parkins 17 April 2008 Outline Quantum networks Cavity QED - Strong coupling cavity QED - Network operations enabled by cavity QED
More informationMesoscopic field state superpositions in Cavity QED: present status and perspectives
Mesoscopic field state superpositions in Cavity QED: present status and perspectives Serge Haroche, Ein Bokek, February 21 st 2005 Entangling single atoms with larger and larger fields: an exploration
More informationDes mesures quantiques non-destructives et des bruits quantiques.
Des mesures quantiques non-destructives et des bruits quantiques. (Un peu de mécanique quantique, un soupçon de probabilités,...) with M. Bauer Jan. 2013 intensity, that is, the creation of a thermal photon,
More informationQuantum Memory with Atomic Ensembles. Yong-Fan Chen Physics Department, Cheng Kung University
Quantum Memory with Atomic Ensembles Yong-Fan Chen Physics Department, Cheng Kung University Outline Laser cooling & trapping Electromagnetically Induced Transparency (EIT) Slow light & Stopped light Manipulating
More informationDispersive Readout, Rabi- and Ramsey-Measurements for Superconducting Qubits
Dispersive Readout, Rabi- and Ramsey-Measurements for Superconducting Qubits QIP II (FS 2018) Student presentation by Can Knaut Can Knaut 12.03.2018 1 Agenda I. Cavity Quantum Electrodynamics and the Jaynes
More informationCavity QED with Rydberg Atoms Serge Haroche, Collège de France & Ecole Normale Supérieure, Paris
Cavity QED with Rydberg Atoms Serge Haroche, Collège de France & Ecole Normale Supérieure, Paris A three lecture course Goal of lectures Manipulating states of simple quantum systems has become an important
More informationCircuit Quantum Electrodynamics. Mark David Jenkins Martes cúantico, February 25th, 2014
Circuit Quantum Electrodynamics Mark David Jenkins Martes cúantico, February 25th, 2014 Introduction Theory details Strong coupling experiment Cavity quantum electrodynamics for superconducting electrical
More informationQuantum Optics with Electrical Circuits: Strong Coupling Cavity QED
Quantum Optics with Electrical Circuits: Strong Coupling Cavity QED Ren-Shou Huang, Alexandre Blais, Andreas Wallraff, David Schuster, Sameer Kumar, Luigi Frunzio, Hannes Majer, Steven Girvin, Robert Schoelkopf
More informationLecture 3 Quantum non-demolition photon counting and quantum jumps of light
Lecture 3 Quantum non-demolition photon counting and quantum jumps of light A stream of atoms extracts information continuously and non-destructively from a trapped quantum field Fundamental test of measurement
More informationTheoretical design of a readout system for the Flux Qubit-Resonator Rabi Model in the ultrastrong coupling regime
Theoretical design of a readout system for the Flux Qubit-Resonator Rabi Model in the ultrastrong coupling regime Ceren Burçak Dağ Supervisors: Dr. Pol Forn-Díaz and Assoc. Prof. Christopher Wilson Institute
More informationTowards new states of matter with atoms and photons
Towards new states of matter with atoms and photons Jonas Larson Stockholm University and Universität zu Köln Aarhus Cold atoms and beyond 26/6-2014 Motivation Optical lattices + control quantum simulators.
More informationSupplementary Figure 1: Reflectivity under continuous wave excitation.
SUPPLEMENTARY FIGURE 1 Supplementary Figure 1: Reflectivity under continuous wave excitation. Reflectivity spectra and relative fitting measured for a bias where the QD exciton transition is detuned from
More informationPractical realization of Quantum Computation
Practical realization of Quantum Computation Cavity QED http://www.quantumoptics.ethz.ch/ http://courses.washington.edu/ bbbteach/576/ http://www2.nict.go.jp/ http://www.wmi.badw.de/sfb631/tps/dipoletrap_and_cavity.jpg
More informationQuantum jumps of light: birth and death of a photon in a cavity
QCCC Workshop Aschau, 27 Oct 27 Quantum jumps of light: birth and death of a photon in a cavity Stefan Kuhr Johannes-Gutenberg Universität Mainz S. Gleyzes, C. Guerlin, J. Bernu, S. Deléglise, U. Hoff,
More informationNiels Bohr Institute Copenhagen University. Eugene Polzik
Niels Bohr Institute Copenhagen University Eugene Polzik Ensemble approach Cavity QED Our alternative program (997 - ): Propagating light pulses + atomic ensembles Energy levels with rf or microwave separation
More informationCollège de France abroad Lectures Quantum information with real or artificial atoms and photons in cavities
Collège de France abroad Lectures Quantum information with real or artificial atoms and photons in cavities Serge Haroche, Collège de France & Ecole Normale Supérieure, Paris www.college-de-france.fr A
More informationQuantum optics of many-body systems
Quantum optics of many-body systems Igor Mekhov Université Paris-Saclay (SPEC CEA) University of Oxford, St. Petersburg State University Lecture 2 Previous lecture 1 Classical optics light waves material
More informationCavity QED in the Regime of Strong Coupling with Chip-Based Toroidal Microresonators
Cavity QED in the Reime of Stron Couplin with Chip-Based Toroidal Microresonators Barak Dayan, Takao oki, E. Wilcut,. S. Parkins, W. P. Bowen, T. J. Kippenber, K. J. Vahala, and H. J. Kimble California
More informationCircuit QED: A promising advance towards quantum computing
Circuit QED: A promising advance towards quantum computing Himadri Barman Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore, India. QCMJC Talk, July 10, 2012 Outline Basics of quantum
More informationDeterministic Generation of Single Photons from One Atom Trapped in a Cavity
Deterministic Generation of Single Photons from One Atom Trapped in a Cavity J. McKeever, A. Boca, A. D. Boozer, R. Miller, J. R. Buck, A. Kuzmich, H. J. Kimble* Norman Bridge Laboratory of Physics 12-33,
More informationReal Time Imaging of Quantum and Thermal Fluctuations
Real Time Imaging of Quantum and Thermal Fluctuations (A pinch of quantum mechanics, a drop of probability,...) D.B. with M. Bauer, and (in part) T. Benoist & A. Tilloy. arxiv:1106.4953, arxiv:1210.0425,
More informationCavity Quantum Electrodynamics (QED): Coupling a Harmonic Oscillator to a Qubit
Cavity Quantum Electrodynamics (QED): Coupling a Harmonic Oscillator to a Qubit Cavity QED with Superconducting Circuits coherent quantum mechanics with individual photons and qubits...... basic approach:
More informationIntroduction to Circuit QED
Introduction to Circuit QED Michael Goerz ARL Quantum Seminar November 10, 2015 Michael Goerz Intro to cqed 1 / 20 Jaynes-Cummings model g κ γ [from Schuster. Phd Thesis. Yale (2007)] Jaynes-Cumming Hamiltonian
More information8 Quantized Interaction of Light and Matter
8 Quantized Interaction of Light and Matter 8.1 Dressed States Before we start with a fully quantized description of matter and light we would like to discuss the evolution of a two-level atom interacting
More informationCavity Quantum Electrodynamics Lecture 2: entanglement engineering with quantum gates
DÉPARTEMENT DE PHYSIQUE DE L ÉCOLE NORMALE SUPÉRIEURE LABORATOIRE KASTLER BROSSEL Cavity Quantum Electrodynamics Lecture : entanglement engineering with quantum gates Michel BRUNE Les Houches 003 1 CQED
More informationQuantum nonlinear four-wave mixing with a single atom in an optical cavity
Quantum nonlinear four-wave mixing with a single atom in an optical cavity Haytham Chibani Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany (Dated: May 14, 2017)
More informationCircuit Quantum Electrodynamics
Circuit Quantum Electrodynamics David Haviland Nanosturcture Physics, Dept. Applied Physics, KTH, Albanova Atom in a Cavity Consider only two levels of atom, with energy separation Atom drifts through
More informationEfficient routing of single photons by one atom and a microtoroidal cavity
93 Chapter 4 Efficient routing of single photons by one atom and a microtoroidal cavity This chapter is largely based on ref. []. eference [] refers to the then current literature in 29 at the time of
More informationDistributing Quantum Information with Microwave Resonators in Circuit QED
Distributing Quantum Information with Microwave Resonators in Circuit QED M. Baur, A. Fedorov, L. Steffen (Quantum Computation) J. Fink, A. F. van Loo (Collective Interactions) T. Thiele, S. Hogan (Hybrid
More informationTELEPORTATION OF ATOMIC STATES VIA CAVITY QUANTUM ELECTRODYNAMICS
TELEPORTATION OF ATOMIC STATES VIA CAVITY QUANTUM ELECTRODYNAMICS arxiv:quant-ph/0409194v1 7 Sep 004 E. S. Guerra Departamento de Física Universidade Federal Rural do Rio de Janeiro Cx. Postal 3851, 3890-000
More informationThree-Dimensional Quantum State Transferring Between Two Remote Atoms by Adiabatic Passage under Dissipation
Commun. Theor. Phys. (Beijing, China) 54 (2010) pp. 107 111 c Chinese Physical Society and IOP Publishing Ltd Vol. 54, No. 1, July 15, 2010 Three-Dimensional Quantum State Transferring Between Two Remote
More informationCavity Quantum Electrodynamics Lecture 1
DÉPARTEMENT DE PHYSIQUE DE L ÉCOLE NORMALE SUPÉRIEURE LABORATOIRE KASTLER BROSSEL Cavity Quantum Electrodynamics Lecture 1 Michel BRUNE Les Houches 2003 1 Quantum information and Cavity QED Principle of
More informationSupplementary information for Quantum delayed-choice experiment with a beam splitter in a quantum superposition
Supplementary information for Quantum delayed-choice experiment with a beam splitter in a quantum superposition Shi-Biao Zheng 1, You-Peng Zhong 2, Kai Xu 2, Qi-Jue Wang 2, H. Wang 2, Li-Tuo Shen 1, Chui-Ping
More informationElements of Quantum Optics
Pierre Meystre Murray Sargent III Elements of Quantum Optics Fourth Edition With 124 Figures fya Springer Contents 1 Classical Electromagnetic Fields 1 1.1 Maxwell's Equations in a Vacuum 2 1.2 Maxwell's
More informationQuantum computing with cavity QED
Quantum computing with cavity QED Ch. J. Schwarz Center for High Technology Materials, University of New Mexico, 1313 Goddard Street SE Albuquerque, New Mexico 87106 Physics & Astronomy, University of
More informationCooperative atom-light interaction in a blockaded Rydberg ensemble
Cooperative atom-light interaction in a blockaded Rydberg ensemble α 1 Jonathan Pritchard University of Durham, UK Overview 1. Cooperative optical non-linearity due to dipole-dipole interactions 2. Observation
More informationCoherent states, beam splitters and photons
Coherent states, beam splitters and photons S.J. van Enk 1. Each mode of the electromagnetic (radiation) field with frequency ω is described mathematically by a 1D harmonic oscillator with frequency ω.
More informationarxiv:quant-ph/ v3 19 May 1997
Correcting the effects of spontaneous emission on cold-trapped ions C. D Helon and G.J. Milburn Department of Physics University of Queensland St Lucia 407 Australia arxiv:quant-ph/9610031 v3 19 May 1997
More informationPhotonic Micro and Nanoresonators
Photonic Micro and Nanoresonators Hauptseminar Nanooptics and Nanophotonics IHFG Stuttgart Overview 2 I. Motivation II. Cavity properties and species III. Physics in coupled systems Cavity QED Strong and
More informationCode: ECTS Credits: 6. Degree Type Year Semester
Quantum Optics 2016/2017 Code: 100180 ECTS Credits: 6 Degree Type Year Semester 2500097 Physics OT 4 0 Contact Name: Verónica Ahufinger Breto Email: Veronica.Ahufinger@uab.cat Teachers Use of languages
More information10.5 Circuit quantum electrodynamics
AS-Chap. 10-1 10.5 Circuit quantum electrodynamics AS-Chap. 10-2 Analogy to quantum optics Superconducting quantum circuits (SQC) Nonlinear circuits Qubits, multilevel systems Linear circuits Waveguides,
More informationMESOSCOPIC QUANTUM OPTICS
MESOSCOPIC QUANTUM OPTICS by Yoshihisa Yamamoto Ata Imamoglu A Wiley-Interscience Publication JOHN WILEY & SONS, INC. New York Chichester Weinheim Brisbane Toronto Singapore Preface xi 1 Basic Concepts
More informationAbsorption and Fluorescence Studies on Hyperfine Spectra of Rb and Dressed state picture
Absorption and Fluorescence Studies on Hyperfine Spectra of Rb and Dressed state picture Sabyasachi Barik National Institute of Science Education and Research, Bhubaneswar Project guide- Prof. C.S.Unnikrishnan
More informationAtoms and photons. Chapter 1. J.M. Raimond. September 6, J.M. Raimond Atoms and photons September 6, / 36
Atoms and photons Chapter 1 J.M. Raimond September 6, 2016 J.M. Raimond Atoms and photons September 6, 2016 1 / 36 Introduction Introduction The fundamental importance of the atom-field interaction problem
More informationConditional Measurements in cavity QED. Luis A. Orozco Joint Quantum Institute Department of Physics
Conditional Measurements in cavity QED Luis A. Orozco Joint Quantum Institute Department of Physics University of Maryland, College Park, Maryland: Matthew L. Terraciano Rebecca Olson David Norris Jietai
More informationSpontaneous Emission and the Vacuum State of EM Radiation. Miriam Klopotek 10 December 2007
Spontaneous Emission and the Vacuum State of EM Radiation Miriam Klopotek 10 December 2007 Content Introduction Atom inside thermal equilibrium cavity: stimulated emission, absorption and spontaneous decay
More informationSingle Semiconductor Nanostructures for Quantum Photonics Applications: A solid-state cavity-qed system with semiconductor quantum dots
The 3 rd GCOE Symposium 2/17-19, 19, 2011 Tohoku University, Sendai, Japan Single Semiconductor Nanostructures for Quantum Photonics Applications: A solid-state cavity-qed system with semiconductor quantum
More informationQuantum Computation with Neutral Atoms Lectures 14-15
Quantum Computation with Neutral Atoms Lectures 14-15 15 Marianna Safronova Department of Physics and Astronomy Back to the real world: What do we need to build a quantum computer? Qubits which retain
More informationarxiv: v2 [quant-ph] 6 Nov 2007
Cavity QED with a Bose-Einstein condensate Ferdinand Brennecke 1, Tobias Donner 1, Stephan Ritter 1, Thomas Bourdel 2, Michael Köhl 3, and Tilman Esslinger 1 1 Institute for Quantum Electronics, ETH Zürich,
More informationarxiv:quant-ph/ v1 4 Nov 2002
State-Insensitive Trapping of Single Atoms in Cavity QED J. McKeever, J. R. Buck, A. D. Boozer, A. Kuzmich, H.-C. Nägerl, D. M. Stamper-Kurn, and H. J. Kimble Norman Bridge Laboratory of Physics 12-33
More informationFunctional quantum nodes for entanglement distribution
61 Chapter 4 Functional quantum nodes for entanglement distribution This chapter is largely based on ref. 36. Reference 36 refers to the then current literature in 2007 at the time of publication. 4.1
More informationQUANTUM THEORY OF LIGHT EECS 638/PHYS 542/AP609 FINAL EXAMINATION
Instructor: Professor S.C. Rand Date: April 5 001 Duration:.5 hours QUANTUM THEORY OF LIGHT EECS 638/PHYS 54/AP609 FINAL EXAMINATION PLEASE read over the entire examination before you start. DO ALL QUESTIONS
More informationChapter 6. Exploring Decoherence in Cavity QED
Chapter 6 Exploring Decoherence in Cavity QED Serge Haroche, Igor Dotsenko, Sébastien Gleyzes, Michel Brune, and Jean-Michel Raimond Laboratoire Kastler Brossel de l Ecole Normale Supérieure, 24 rue Lhomond
More informationTrapping and Interfacing Cold Neutral Atoms Using Optical Nanofibers
Trapping and Interfacing Cold Neutral Atoms Using Optical Nanofibers Colloquium of the Research Training Group 1729, Leibniz University Hannover, Germany, November 8, 2012 Arno Rauschenbeutel Vienna Center
More informationThe Impact of the Pulse Phase Deviation on Probability of the Fock States Considering the Dissipation
Armenian Journal of Physics, 207, vol 0, issue, pp 64-68 The Impact of the Pulse Phase Deviation on Probability of the Fock States Considering the Dissipation GYuKryuchkyan, HS Karayan, AGChibukhchyan
More informationQuantum Optics and Quantum Informatics FKA173
Quantum Optics and Quantum Informatics FKA173 Date and time: Tuesday, 7 October 015, 08:30-1:30. Examiners: Jonas Bylander (070-53 44 39) and Thilo Bauch (0733-66 13 79). Visits around 09:30 and 11:30.
More informationQuantum computation with superconducting qubits
Quantum computation with superconducting qubits Project for course: Quantum Information Ognjen Malkoc June 10, 2013 1 Introduction 2 Josephson junction 3 Superconducting qubits 4 Circuit and Cavity QED
More informationQuantum Optics exam. M2 LOM and Nanophysique. 28 November 2017
Quantum Optics exam M LOM and Nanophysique 8 November 017 Allowed documents : lecture notes and problem sets. Calculators allowed. Aux francophones (et francographes) : vous pouvez répondre en français.
More informationPhoton Blockade with Memory and Slow Light using a Single Atom in an Optical Cavity
Max-Planck-Institut für Quantenoptik Technische Universität München Photon Blockade with Memory and Slow Light using a Single Atom in an Optical Cavity Haytham Chibani Vollständiger Abdruck der von der
More informationQuantum Computing with neutral atoms and artificial ions
Quantum Computing with neutral atoms and artificial ions NIST, Gaithersburg: Carl Williams Paul Julienne T. C. Quantum Optics Group, Innsbruck: Peter Zoller Andrew Daley Uwe Dorner Peter Fedichev Peter
More informationCMSC 33001: Novel Computing Architectures and Technologies. Lecture 06: Trapped Ion Quantum Computing. October 8, 2018
CMSC 33001: Novel Computing Architectures and Technologies Lecturer: Kevin Gui Scribe: Kevin Gui Lecture 06: Trapped Ion Quantum Computing October 8, 2018 1 Introduction Trapped ion is one of the physical
More informationDiffraction effects in entanglement of two distant atoms
Journal of Physics: Conference Series Diffraction effects in entanglement of two distant atoms To cite this article: Z Ficek and S Natali 007 J. Phys.: Conf. Ser. 84 0007 View the article online for updates
More informationIn Situ Imaging of Cold Atomic Gases
In Situ Imaging of Cold Atomic Gases J. D. Crossno Abstract: In general, the complex atomic susceptibility, that dictates both the amplitude and phase modulation imparted by an atom on a probing monochromatic
More informationLaser Cooling and Trapping of Atoms
Chapter 2 Laser Cooling and Trapping of Atoms Since its conception in 1975 [71, 72] laser cooling has revolutionized the field of atomic physics research, an achievement that has been recognized by the
More informationQuantum Optics with Mesoscopic Systems II
Quantum Optics with Mesoscopic Systems II A. Imamoglu Quantum Photonics Group, Department of Physics ETH-Zürich Outline 1) Cavity-QED with a single quantum dot 2) Optical pumping of quantum dot spins 3)
More informationIntroduction to Modern Quantum Optics
Introduction to Modern Quantum Optics Jin-Sheng Peng Gao-Xiang Li Huazhong Normal University, China Vfe World Scientific» Singapore* * NewJerseyL Jersey* London* Hong Kong IX CONTENTS Preface PART I. Theory
More informationBEC meets Cavity QED
BEC meets Cavity QED Tilman Esslinger ETH ZürichZ Funding: ETH, EU (OLAQUI, Scala), QSIT, SNF www.quantumoptics.ethz.ch Superconductivity BCS-Theory Model Experiment Fermi-Hubbard = J cˆ ˆ U nˆ ˆ i, σ
More informationSingle photon nonlinear optics in photonic crystals
Invited Paper Single photon nonlinear optics in photonic crystals Dirk Englund, Ilya Fushman, Andrei Faraon, and Jelena Vučković Ginzton Laboratory, Stanford University, Stanford, CA 94305 ABSTRACT We
More informationAtomic Coherent Trapping and Properties of Trapped Atom
Commun. Theor. Phys. (Beijing, China 46 (006 pp. 556 560 c International Academic Publishers Vol. 46, No. 3, September 15, 006 Atomic Coherent Trapping and Properties of Trapped Atom YANG Guo-Jian, XIA
More informationVacuum-Induced Transparency
Vacuum-Induced Transparency The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation As Published Publisher Tanji-Suzuki, H., W. Chen,
More informationCoherent Control in Cavity QED
Coherent Control in Cavity QED Thesis by Tracy E. Northup In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy California Institute of Technology Pasadena, California 2008
More informationSingle Emitter Detection with Fluorescence and Extinction Spectroscopy
Single Emitter Detection with Fluorescence and Extinction Spectroscopy Michael Krall Elements of Nanophotonics Associated Seminar Recent Progress in Nanooptics & Photonics May 07, 2009 Outline Single molecule
More informationFeedback control of atomic coherent spin states
Feedback control of atomic coherent spin states Andrea Bertoldi Institut d Optique, France RG Colloquium Hannover 13/12/2012 Feedback control h(t) Constant flow is required to keep time P = r H2O g h(t)
More informationCircuit quantum electrodynamics : beyond the linear dispersive regime
Circuit quantum electrodynamics : beyond the linear dispersive regime 1 Jay Gambetta 2 Alexandre Blais 1 1 Département de Physique et Regroupement Québécois sur les matériaux de pointe, 2 Institute for
More informationLaser cooling and trapping
Laser cooling and trapping William D. Phillips wdp@umd.edu Physics 623 14 April 2016 Why Cool and Trap Atoms? Original motivation and most practical current application: ATOMIC CLOCKS Current scientific
More informationSaturation Absorption Spectroscopy of Rubidium Atom
Saturation Absorption Spectroscopy of Rubidium Atom Jayash Panigrahi August 17, 2013 Abstract Saturated absorption spectroscopy has various application in laser cooling which have many relevant uses in
More informationB2.III Revision notes: quantum physics
B.III Revision notes: quantum physics Dr D.M.Lucas, TT 0 These notes give a summary of most of the Quantum part of this course, to complement Prof. Ewart s notes on Atomic Structure, and Prof. Hooker s
More informationQuantum Simulation with Rydberg Atoms
Hendrik Weimer Institute for Theoretical Physics, Leibniz University Hannover Blaubeuren, 23 July 2014 Outline Dissipative quantum state engineering Rydberg atoms Mesoscopic Rydberg gates A Rydberg Quantum
More informationOIST, April 16, 2014
C3QS @ OIST, April 16, 2014 Brian Muenzenmeyer Dissipative preparation of squeezed states with ultracold atomic gases GW & Mäkelä, Phys. Rev. A 85, 023604 (2012) Caballar et al., Phys. Rev. A 89, 013620
More informationManipulating Single Atoms
Manipulating Single Atoms MESUMA 2004 Dresden, 14.10.2004, 09:45 Universität Bonn D. Meschede Institut für Angewandte Physik Overview 1. A Deterministic Source of Single Neutral Atoms 2. Inverting MRI
More informationShort Course in Quantum Information Lecture 8 Physical Implementations
Short Course in Quantum Information Lecture 8 Physical Implementations Course Info All materials downloadable @ website http://info.phys.unm.edu/~deutschgroup/deutschclasses.html Syllabus Lecture : Intro
More informationarxiv: v3 [quant-ph] 22 Dec 2012
Storage and control of optical photons using Rydberg polaritons D. Maxwell 1*, D. J. Szwer 1, D. P. Barato 1, H. Busche 1, J. D. Pritchard 1, A. Gauguet 1, K. J. Weatherill 1, M. P. A. Jones 1, and C.
More informationarxiv: v1 [quant-ph] 16 May 2007
Light-shift-induced photonic nonlinearities F.G.S.L. Brandão,, M.J. Hartmann,, and M.B. Plenio, QOLS, Blackett Laboratory, Imperial College London, London SW7 AZ, UK IMS, Imperial College London, 53 Prince
More information4. Spontaneous Emission october 2016
4. Spontaneous Emission october 016 References: Grynberg, Aspect, Fabre, "Introduction aux lasers et l'optique quantique". Lectures by S. Haroche dans "Fundamental systems in quantum optics", cours des
More informationSuperconducting quantum bits. Péter Makk
Superconducting quantum bits Péter Makk Qubits Qubit = quantum mechanical two level system DiVincenzo criteria for quantum computation: 1. Register of 2-level systems (qubits), n = 2 N states: eg. 101..01>
More informationIon trap quantum processor
Ion trap quantum processor Laser pulses manipulate individual ions row of qubits in a linear Paul trap forms a quantum register Effective ion-ion interaction induced by laser pulses that excite the ion`s
More informationSUPPLEMENTARY INFORMATION
Supporting online material SUPPLEMENTARY INFORMATION doi: 0.038/nPHYS8 A: Derivation of the measured initial degree of circular polarization. Under steady state conditions, prior to the emission of the
More informationDipole-coupling a single-electron double quantum dot to a microwave resonator
Dipole-coupling a single-electron double quantum dot to a microwave resonator 200 µm J. Basset, D.-D. Jarausch, A. Stockklauser, T. Frey, C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin and A. Wallraff Quantum
More informationLecture 11, May 11, 2017
Lecture 11, May 11, 2017 This week: Atomic Ions for QIP Ion Traps Vibrational modes Preparation of initial states Read-Out Single-Ion Gates Two-Ion Gates Introductory Review Articles: D. Leibfried, R.
More informationBuilding Blocks for Quantum Computing Part IV. Design and Construction of the Trapped Ion Quantum Computer (TIQC)
Building Blocks for Quantum Computing Part IV Design and Construction of the Trapped Ion Quantum Computer (TIQC) CSC801 Seminar on Quantum Computing Spring 2018 1 Goal Is To Understand The Principles And
More information