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Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors

Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors
Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors
Quantum memories are a crucial technology for enabling large-scale quantum networks through synchronization of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapor platforms are promising candidates, combining efficient high-bandwidth operation with low-noise on-demand retrieval. However, their storage time is severely limited by motion-induced dephasing caused by the broad velocity distribution of atoms composing the vapor. In this paper, we demonstrate velocity selective optical pumping to overcome this decoherence mechanism. This will increase the achievable memory storage time of vapor memories. This technique can also be used for preparing arbitrarily shaped absorption profiles, for instance, preparing an atomic frequency comb absorption feature.
1050-2947
Main, D.
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Hird, T.M.
1ac1ef60-3c1b-4ed1-bb89-a376878bd815
Gao, S.
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Oguz, E.
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Saunders, D. J.
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Walmsley, I.A.
a9b02ef9-f5d9-473f-ac01-bbbe06d28170
Ledingham, P.
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Main, D.
66b704bd-5b26-4503-9426-7e4d4c8b7dd6
Hird, T.M.
1ac1ef60-3c1b-4ed1-bb89-a376878bd815
Gao, S.
29a7360f-d8cc-4f08-99f4-78262d628c46
Oguz, E.
881dc56a-ba8c-40b7-8ce9-28e398ab65db
Saunders, D. J.
8d590c4e-2ea0-439c-bf42-03192c9eb60e
Walmsley, I.A.
a9b02ef9-f5d9-473f-ac01-bbbe06d28170
Ledingham, P.
8db45fde-00d8-421a-93d6-7f18ac835c28

Main, D., Hird, T.M., Gao, S., Oguz, E., Saunders, D. J., Walmsley, I.A. and Ledingham, P. (2021) Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors. Physical Review A, 103 (4), [043105]. (doi:10.1103/PhysRevA.103.043105).

Record type: Article

Abstract

Quantum memories are a crucial technology for enabling large-scale quantum networks through synchronization of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapor platforms are promising candidates, combining efficient high-bandwidth operation with low-noise on-demand retrieval. However, their storage time is severely limited by motion-induced dephasing caused by the broad velocity distribution of atoms composing the vapor. In this paper, we demonstrate velocity selective optical pumping to overcome this decoherence mechanism. This will increase the achievable memory storage time of vapor memories. This technique can also be used for preparing arbitrarily shaped absorption profiles, for instance, preparing an atomic frequency comb absorption feature.

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Preparing narrow velocity distributions for quantum memories in room-temperature alkali-metal vapors - Accepted Manuscript
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Accepted/In Press date: 29 March 2021
e-pub ahead of print date: 12 April 2021
Published date: 12 April 2021
Additional Information: Funding Information: The authors would like to thank X. Peng and H. Guo for kindly providing the paraffin-coated cell for this work. This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC) through a Standard Grant No. EP/J000051/1, a Programme Grant No. EP/K034480/1, and the EPSRC Hub for Networked Quantum Information Technologies (NQIT) Grant No. EP/M013243/1. We also acknowledge the European Union's FP7 under Grant Agreement ID 339918 (MOQUACINO), and the Horizon 2020 research and innovation program under Grant Agreement No. 899814 (Qurope). T.M.H. is supported via the EPSRC Training and Skills Hub InQuBATE Grant No. EP/P510270/1. Publisher Copyright: © 2021 American Physical Society.

Identifiers

Local EPrints ID: 449739
URI: http://eprints.soton.ac.uk/id/eprint/449739
ISSN: 1050-2947
PURE UUID: 6ee626df-1d2f-40ba-875b-ea476b5c89ad

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Date deposited: 15 Jun 2021 16:32
Last modified: 21 Nov 2022 18:07

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Contributors

Author: D. Main
Author: T.M. Hird
Author: S. Gao
Author: E. Oguz
Author: D. J. Saunders
Author: I.A. Walmsley
Author: P. Ledingham

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