Amplification, entanglement and storage of microwave radiation using superconducting circuits
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1 Amplification, entanglement and storage of microwave radiation using superconducting circuits Jean-Damien Pillet Philip Kim s group at Columbia University, New York, USA Work done in Quantum Electronics group, LPA Ecole Normale Supérieure de Paris, France University of Virginia - April 24th
2 Microwave: powerful and versatile platform Standard commercial apparatuses due to decades of use in telecommunica>on Vector Network Analyzer Cable Direc5onal coupler Amplifier Microwave generator Circulator Phase 2
3 Processing at single photon level LC circuit Harmonic oscillator 3
4 A unique component: the Josephson junction Dimensions ~ 100 nm < wavelength ~ 1 cm => metamaterials 4
5 Josephson circuits Strongly anharmonic oscillator Weakly anharmonic oscillator L J C L 5
6 State preparation in microwave quantum optics Strongly anharmonic oscillator P. Campagne-Ibarcq et al., PRX 2013 Two-level system M. Devoret et al., Science
7 State preparation in microwave quantum optics Strongly anharmonic oscillator Two-level system Weakly anharmonic oscillator Harmonic oscillator continuous variable 7
8 State preparation in microwave quantum optics Vacuum state Weakly anharmonic oscillator Coherent state Harmonic oscillator continuous variable 8
9 State preparation in microwave quantum optics Fock states and superpositions Cavity QED (Haroche, Paris) M. Hofheinz et al., Nature 2010 Schrödinger cats Squeezed vacuum state G. Kirchmair et al., Nature mode F. Mallet et al., PRL mode C. Eichler et al., PRL
10 State preparation in microwave quantum optics Fock states and superpositions Cavity QED (Haroche, Paris) G. Kirchmair et al., Nature 2013 M. Hofheinz et al., Nature 2010 Schrödinger cats High fidelity measurement phase-preserving amplifier Storage of microwave quantum state quantum memory Generation of entanglement over 2 spatially separated modes 1-mode Squeezed vacuum state F. Mallet et al., PRL mode C. Eichler et al., PRL
11 Microwave phase preserving amplifiers best commercial amplifiers (4K) 4K at 2.5 GHz = 40 photons of noise 11
12 Microwave phase preserving amplifiers best commercial amplifiers (4K) 4K at 2.5 GHz = 40 photons of noise 12
13 Microwave phase preserving amplifiers best commercial amplifiers (4K) 4K at 2.5 GHz = 40 photons of noise Quantum limited amplifier ½ quantum of noise (Caves, PRD 1982) 13
14 Three wave mixing at microwave frequencies Lithium Triborate LBO Crystals 14
15 Three wave mixing at microwave frequencies Classical diode : non- linear and dissipa>ve 15
16 Three wave mixing at microwave frequencies Jospehson junc>on : non- linear and non- dissipa>ve 16
17 Josephson mixer 17
18 Amplification or Conversion Quantum limited amplifier Entanglement source Noiseless frequency converter Tunable coupler 2-mode squeezing operator 18
19 Amplification or Conversion Basis of quantum limited amplification: Stimulated emission Quantum limited amplifier Entanglement source 2-mode squeezing operator 19
20 Amplification or Conversion Commercial Basis of quantum limited amplification: Stimulated emission Quantum limited Phase-preserving quantum limited amplifier ½ quantum of noise (Caves, PRD 1982) 2-mode squeezing operator 20
21 Distributed or lumped resonators λ/2 resonators High Q Bergeal et al., Nature 2010 N. Roch et al., PRL 2012 Lumped elements Low Q Optimal design for amplifier 21
22 Why lumped is the optimum amplifier? 22
23 Why lumped is the optimum amplifier? Amplification is a trade off small => non-linearity too weak large => junctions can t sustain few photons 23
24 Why lumped is the optimum amplifier? 24
25 Why lumped is the optimum amplifier? 25
26 Why lumped is the optimum amplifier? High Q => slower, smaller bandwidth Larger bandwidth for similar performance 26
27 Realization 10 um T=40 mk 27
28 Setup 28
29 Characterization of the resonators Measurement of the resonant frequency Pump OFF, G=1 29
30 Characterization of the resonators Measurement of the resonant frequency C = 3pF L = 360 ph p = 25% Pump OFF, G=1 30
31 Characterization of the resonators Measurement of the resonant frequency C = 3pF L = 360 ph p = 25% C = 6pF L = 260 ph p = 35% Pump OFF, G=1 C = 3-6pF L = ph p = 25-35% Very Large tunability (thanks to large p) 31
32 Amplification Fixed flux Pump ON - More than 50 MHz at 20dB - One order of magnitude higher than Josephson amplifier with distributed resonator 32
33 Amplification Pump ON Fixed flux Large bandwith => multiplexing of qubits Low Q => fast enough for Quantum feedback 33
34 Quantum limited 50 Ohm noise source (controllable temperature) Black body radiation 34
35 Quantum limited Josephson amplifier Black body radiation 35
36 Quantum limited Commercial amplifier Black body radiation 36
37 Quantum limited Commercial amplifier Black body radiation 37
38 Quantum limited Commercial amplifier Black body radiation 38
39 Quantum limited T = 50 mk Black body radiation Amplified noise source radiation Less than 0.2 photons of noise Quantum limited amplifier ½ quantum of noise (Caves, PRD 1982) Half photon 0.6 photon => Near quantum limit Minimum Quantum noise Amplifier extra noise 39
40 Dynamical range Amplifier suitable for few photons measurements 40
41 Low Q versus high Q Low Q Higher bandwidth Faster Optimal amplifier High Q Longer lifetime resonator Quantum memory 41
42 Quantum memory for microwave Mechanical resonator High Q 2D cavity Palomaki et al., Nature 2013 Spin ensembles Yin et al., PRL 2013 Zhu et al., Nature 2011 Kubo et al., PRL
43 3D cavity for storage High-Q superconducting cavities G. Kirchmair et al., Nature 2013 Q up to 1 million 43
44 Quantum memory for microwaves Transmission line (50Ω) Buffer Tunable coupling Memory resonator 44
45 Quantum memory for microwaves Transmission line (50Ω) Dynamically tunable mirror 45
46 Quantum memory for microwaves memory cavity 3D superconducting cavity for enhanced storage time 46
47 Quantum memory for microwaves JJ Fast tunable coupling Josephson Ring 47
48 Quantum memory for microwaves buffer cavity bandwidth vs efficiency 48
49 Quantum memory for microwaves down to 40 mk 49
50 Pulsed experiment? Control field Control field What waveform can the memory capture optimally? waveform released by the memory Control field Control field waveform optimally capture time reverse 50
51 Quantum memory for microwaves Write the memory Pompe ON => Coupling ON 51
52 Quantum memory for microwaves Write the memory Pompe OFF ON => Coupling ON OFF 52
53 Quantum memory for microwaves Read the memory Pompe ON => Coupling ON 53
54 Coupling OFF Pump OFF time 54
55 Coupling OFF Pump OFF time 55
56 Optimal capture ON Pump OFF 56
57 Optimal capture ON Pump OFF ON 57
58 Optimal capture and delayed retrieval writing/reading time 58
59 Quantum memory performance writing/reading time storage time time bandwidth product efficiency 59
60 Entanglement generation buffer cavity memory cavity transmission line Entanglement generation Generating Entangled Microwave Radiation Over Two Transmission Lines, E. Flurin et al., PRL
61 Entanglement generation Hamiltonian evolution 2-mode squeezing operator Quantum limited amplifier Entanglement source 61
62 Entanglement generation 62
63 Retrieval 63
64 Squeezed cross-correlation 64
65 Squeezed cross-correlation Eichler et al., PRL 2011 Menzel et al. PRL 2012 points measurement time 65
66 Experimental results Control field ON 66
67 Amplification chain noise Uncorrelated noise from the amplifiers 67
68 Experimental results Control field OFF 68
69 Experimental results Subtracted ON-OFF histograms 69
70 Measured covariance matrix 70
71 Covariance matrix and entanglement witness Logarithmic negativity Purity Entanglement threshold 71
72 Conclusions Optimal phase preserving amplifier Quantum memory Generation of entanglement on demand Pillet et al., in preparation Flurin, Roch, Pillet et al., arxiv:
73 Thanks Vladimir MANUCHARYAN Landry BRETHEAU Michel DEVORET Emmanuel FLURIN Nicolas ROCH Benjamin HUARD François MALLET Philippe CAMPAGNE-IBARCQ 73
74 Perspectives Pas de pause Pas de repit Marquer le temps entre slides de transi>on 74
75 Perspectives Teleportation of a quantum state from one memory to another Teleporation 75
76 Perspectives Teleportation of a quantum state from one memory to another Teleporation 76
77 Trash 77
78 Microwave: powerful and versa6le pla7orm rocessed at the single photon level with non- dissipa>ve superconduc>ng In dilu>on fridge T=30mK dd superconduc>ng qubit Transmission line Direc5onal coupler Quantum ampli Circulator Ku et al., Applied Superconduc;vity (2011) Quantum Memory Kamal et al., Nat. Phys Sev Palo arxi 78
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