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Neutral Atom Quantum Memories

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Long-lived, Interacting Neutral Atom
Quantum Memories
A.	
  Marchenkova,	
  Y.	
  O.	
  Dudin,	
  A.	
  G.	
  Radnaev,	
  R.	
  Zhao,	
  J.	
  Z.	
  Blumoff,	
  
S.	
  D.	
  Jenkins,	
  T.	
  A.	
  B.	
  Kennedy	
  and	
  A.	
  Kuzmich	
  	
  
	
  
ACC Meeting of the Minds 2011
Applications
Quantum cryptography
Quantum computers
Qubits – superposition of states
nuclear spin, atoms, photons
Quantum Properties
Uncertainty
Interference
Entanglement
Collective matter excitations
Neutral atoms
Ions
Quantum telecommunication
Long lived quantum memory
Rubidium
spinwave signal
idler
write
read
50 µm –
Motional coherence
a
b
c
write
signal
read
idler
DLCZ Protocol
795 nm emission
Laser cooling
Differential ac-Stark shift limited lifetime
5 ms
7 ms

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Neutral Atom Quantum Memories

  • 1. Long-lived, Interacting Neutral Atom Quantum Memories A.  Marchenkova,  Y.  O.  Dudin,  A.  G.  Radnaev,  R.  Zhao,  J.  Z.  Blumoff,   S.  D.  Jenkins,  T.  A.  B.  Kennedy  and  A.  Kuzmich       ACC Meeting of the Minds 2011
  • 2. Applications Quantum cryptography Quantum computers Qubits – superposition of states nuclear spin, atoms, photons Quantum Properties Uncertainty Interference Entanglement Collective matter excitations Neutral atoms Ions Quantum telecommunication
  • 5. spinwave signal idler write read 50 µm – Motional coherence a b c write signal read idler DLCZ Protocol 795 nm emission Laser cooling
  • 6. Differential ac-Stark shift limited lifetime 5 ms 7 ms
  • 7. Classical and quantum light storage Storage of coherent light: 07.00.0)ms60( ±=α 12.018.0)s1.0( ±=α Storage of single photons: 0/0, 1/-1, -1/1 coherences are observed to have similar lifetimes, limited by the 0.5 W power of the 931 nm light 0.12 s (48 µK)12 ms 0.07 s (62 µK) 0.17 s (33 µK)
  • 8. Light storage in a 1D optical lattice Clock coherence 15 ms 0.32 s Y. O. Dudin et al, PRA 81, 041805 (2010) efficiency lifetime this work 3.3 % 0.32 s Mott insulator* 0.3 % 0.24 s
  • 10. Communication channels Free space: satellites, ground stations Waveguides: Telecommunication fibers Nobel prize 2009 / 2 "for groundbreaking achievements concerning the transmission of light in fibers for optical communication“ Charles K. Kao ≤ 2.50 dB/km @ 795 nm ≤ 0.35 dB/km @ 1310 nm ≤ 0.20 dB/km @ 1550 nm 1 mile 8 miles 13 miles
  • 11. Telecom transitions for quantum memories •  Alkalis (Rb, Cs, K, Na) T. Chaneliere et al, PRL 96, 093604 (2006) 5S1/2 6S1/2 5P1/2 5P3/2 4D3/2 4D5/21324 1367 1475 1529 Rb telecom transitions There may be potential telecom transitions in other systems (quantum dots, ions,…)
  • 14. Quantum memory entangled with telecom light memory @ 1ms memory with telecom @ 1 µs
  • 15. Long-lived quantum memory Experiment Professor Alex Kuzmich Graduate students: Corey Campbell (Th) Yaroslav Dudin (Rb) Alex Radnaev (Rb, Th) Ran Zhao (Rb) Undergraduate students: Anastasia Marchenkova (Rb) Jacob Blumoff (Rb, Th) Theory Professor Brian Kennedy Post-docs Francesco Bariani Stewart Jenkins (Southampton) Graduate students: Richard Jen Tingnan Zhang