Neutral Atom Quantum Memories
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Sara D. Jenkins Summary This document describes research on developing long-lived quantum memories using neutral atoms. Key points: - Neutral atom quantum memories could enable applications like quantum cryptography and quantum computing. - The research uses rubidium atoms to store quantum information in the form of spin waves or collective atomic excitations. - They demonstrate storage of coherent light and single photons for up to 0.32 seconds by trapping atoms in an optical lattice. - The goal is to develop quantum memories that operate at telecommunication wavelengths for long-distance quantum communication over fiber networks. Transitions in rubidium and other alkali atoms are identified that could enable this.
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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
- 3. Long lived quantum memory
- 4. Rubidium
- 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,…)
- 12. Telecom compatible long-lived quantum memory
- 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