Neutral Atom Quantum Memories
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Transcript of Neutral Atom Quantum Memories
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
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)
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
Telecom wavelengths
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
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 4D5/2 1324
1367 1475
1529
Rb telecom transitions
There may be potential telecom transitions in other systems (quantum dots, ions,…)
Telecom compatible long-lived quantum memory
Quantum memory entangled with telecom light
memory @ 1ms memory with telecom @ 1 µs
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