Joint Quantum Centre Durham/Newcastle. Durham

Transcription

1 Joint Quantum Centre Durham/Newcastle Acknowledgements Durham (Current) Staff: MPA Jones, KJ Weatherill PDRA: P Huillery PhD: H Busche, S Ball, T Ilieva C Wade, N Sibalic Durham Theory Collaborations Nottingham: I Lesanovsky. Dresden T Pohl Finance Former members PDRA: A Mohapatra (NISER), A Gauguet (Toulouse), U Krohn D Szwer (NPL) PhD: MG Bason (Aarhus), JD Pritchard (Wisc), RP Abel D Maxwell (CERN), D Paredes (ICFO)

2 From Rydberg EIT to quantum non-linear optics Rydberg EIT 46d Giant optical non-linearity Rydberg quantum optics Non-equilibrium phase transition Maxwell et al., Phys. Rev. Lett. 110, (2013). XXZ model Mohapatra et al., Phys. Rev. Lett. 98, (2007). Carr et al., Phys. Lev. Lett. 111, (2013). Pritchard et al., Phys. Rev. Lett. 105, (2010). Rydberg non-linear optics, Pritchard et al., Annual Review of Cold Atoms and Molecules, 1, 301 (2013).

3 Ground states to highly-excited Rydberg states

4 Ground states to highly-excited Rydberg states Dipole moment Rydberg ns Rydberg np Dipole moment Ground s Rydberg np Lifetime Sensitivity to E fields Resonant dipole dipole ns,np van der Waals interactions ns,ns Sensors Quantum optics many body

5 Rydberg inspiration! 2004 Frederick Merkt, ETH ECAMP Rennes 2004 Millimeter wave spectroscopy of argon

6 Rydberg atom detection Fluorescence (low n) Ionisation (high n) n = 10 Haroche et al., Phys. Rev. Lett. 33, 1063 (1974). n = 41 Fabre et al., Phys. Rev. A 18, 229 (1978).

7 Electromagnetically induced transparency Boller, Imamoglu and Harris, Phys. Rev. Lett. 66, 2593 (1991).

8 Ladder EIT with Rydbergs? J Gea Banacloche, Y Li, S Jin, M Xiao, Phys Rev A 51, 576 (1995). S Badger, IG Hughes and CS Adams, J. Phys. B 34, L749 (2001).

9 Ladder EIT: limited utility?

10 Ladder EIT with Rydbergs? Dipole moment ns np Dipole moment gs np Lifetime Sensitivity to E fields Resonant dipole dipole ns,np van der Waals interactions ns,ns

11 Ladder EIT with Rydbergs? A problem Dipole moment ns np Dipole moment p ns Lifetime Sensitivity to E fields Resonant dipole dipole ns,np van der Waals interactions ns,ns

12 Ladder EIT? Clarke and van Wijngaarden, Phys. Rev. A 64, (2001). 365 mw

13 Experiment summer 2006

14 1 st Rydberg EIT ( ) Thermal vapour

15 1 st Rydberg EIT ( ) Photodiode signal Oscilloscope trace Saturation spectroscopy 5s 5p 26d EIT Laser detuning

16 Rydberg EIT n = 46 d 2 MHz Mohapatra et al., Phys. Rev. Lett. 98, (2007).

17 Rydberg EIT: giant Kerr effects Non-linearity Slope (EIT) Shift (Rydberg) Bad slope! 2 - level 3 - level EIT Good slope!

18 Ladder EIT with Rydbergs: non-linearity Dipole moment ns np Dipole moment p ns Lifetime Kerr effect Sensitivity to E fields Resonant dipole dipole ns,np van der Waals interactions ns,ns

19 Ladder EIT with Rydbergs: non-linearity Dipole moment ns np Dipole moment p ns Lifetime Sensitivity to E fields Optical Kerr effect Resonant dipole dipole ns,np van der Waals interactions ns,ns

20 Early theory

21 1 st Rydberg EIT in cold atoms (2008)

22 Rydberg EIT (2010) Pritchard et al, PRL 105, (2010) n = 46 s

23 Dipole blockade and Rydberg EIT Rydberg polaritons Pritchard et al, PRL 105, (2010)

24 Giant optical non-linearity Rydberg non-linear optics, Pritchard et al., Ann. Rev. of Cold Atoms and Mol., 1, 301 (2013). arxiv: Optical Kerr effect Kerr non-linearity

25 A photon-photon processor? Rydberg non-linear optics, Pritchard et al., Ann. Rev. of Cold Atoms and Mol., 1, 301 (2013). arxiv: Kerr non-linearity

26 A photon-photon processor? Rydberg non-linear optics, Pritchard et al., Ann. Rev. of Cold Atoms and Mol., 1, 301 (2013). arxiv: Kerr non-linearity JH Shapiro, Single-photon Kerr nonlinearities do not help quantum computation, Phys Rev A 76, (2006) J Gea Banacloche, Impossibility of large phase shifts via the giant Kerr effect with single-photon wave packets, Phys Rev A 81, (2010)

27 Rydberg quantum optics Georgia Tech Harvard/MIT Durham Dudin et al, Science 336, 887 (2012) Peyronel et al, Nature 488, 57 (2012) Maxwell et al, PRL 110, (2013) plus Heidelberg, Garching, Stuttgart, Paris, ICFO

28 Interface: optical, THz, microwave and rf GHz Cs levels

29 Optically trapped ultracold Rb atoms Experiment: laser cooled Rb atoms See D Maxwell, PhD thesis 2 mm 15 mm 5 mm Maxwell et al., Phys. Rev. Lett. 110, (2013).

30 Rydberg quantum memory Rydberg polaritons! Maxwell et al., Phys. Rev. Lett. 110, (2013).

31 Anti-bunching: memory is blockaded 2 mm 15 mm 5 mm Limited to 3 polaritons! Maxwell et al., Phys. Rev. Lett. 110, (2013).

32 Microwave control of photon-photon interactions Maxwell et al., Phys. Rev. A 110, (2014). Increasing microwave power

33 Microwave control of photon-photon interactions Maxwell et al., Phys. Rev. A 110, (2014). Increasing microwave power

34 Microwave control of photon-photon interactions Maxwell et al., Phys. Rev. A 110, (2014). Increasing microwave power Theory: dephasing of spin waves. Bariani et al., Phys. Rev. Lett. 108, (2012).

35 A photon-photon processor Paredes-Barato et al., Phys. Lev. Lett. 112, (2014). Write Retrieve JH Shapiro, Single-photon Kerr nonlinearities do not help quantum computation, Phys Rev A 76, (2006) J Gea Banacloche, Impossibility of large phase shifts via the giant Kerr effect with single-photon wave packets, Phys Rev A 81, (2010)

36 Excitation hopping: XXZ spin model Hopping between single atoms: Barredo et al., arxiv:1408:1055

37 Exciton dynamics: XXZ spin model S Bettelli et al, PRA 88, (2013) Driving Hopping XXZ model

38 3 photon Rydberg EIT: 6s 6p 7s 26p 785 nm

39 3 photon EIT C. Carr et al. Opt. Lett. 37, 3858 (2012). Long cell (low density) Short cell (higher density)

40

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42 Phase transition

43 Non-equilibrium phase transition Seattle PI

44 Intrinsic optical bistability Lorentz shift

45 Superradiant cascade

46 Summary Rydberg non-linear optics, Pritchard et al., Ann. Rev. of Cold Atoms and Mol., 1, 301 (2013). 1. Rydberg EIT: 2. Microwave to optical interface 3. Phase transition

47 Superradiant [?] depopulation of 26p

48 Superradiant cascade [?]