Raman quantum memory with built-in suppression of four-wave-mixing noise
Raman quantum memory with built-in suppression of four-wave-mixing noise
Quantum memories are essential for large-scale quantum information networks. Along with high efficiency, storage lifetime, and optical bandwidth, it is critical that the memory adds negligible noise to the recalled signal. A common source of noise in optical quantum memories is spontaneous four-wave mixing. We develop and implement a technically simple scheme to suppress this noise mechanism by means of quantum interference. Using this scheme with a Raman memory in warm atomic vapor, we demonstrate over an order of magnitude improvement in noise performance. Furthermore we demonstrate a method to quantify the remaining noise contributions and present a route to enable further noise suppression. Our scheme opens the way to quantum demonstrations using a broadband memory, significantly advancing the search for scalable quantum photonic networks.
Thomas, S.E.
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Hird, T.M.
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Munns, J.H.D.
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Brecht, B.
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Saunders, D.J.
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Nunn, J.
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Walmsley, I.A.
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Ledingham, P.M.
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3 September 2019
Thomas, S.E.
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Hird, T.M.
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Munns, J.H.D.
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Brecht, B.
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Saunders, D.J.
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Nunn, J.
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Walmsley, I.A.
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Ledingham, P.M.
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Thomas, S.E., Hird, T.M., Munns, J.H.D., Brecht, B., Saunders, D.J., Nunn, J., Walmsley, I.A. and Ledingham, P.M.
(2019)
Raman quantum memory with built-in suppression of four-wave-mixing noise.
Physical Review A, 100 (3), [033801].
(doi:10.1103/PhysRevA.100.033801).
Abstract
Quantum memories are essential for large-scale quantum information networks. Along with high efficiency, storage lifetime, and optical bandwidth, it is critical that the memory adds negligible noise to the recalled signal. A common source of noise in optical quantum memories is spontaneous four-wave mixing. We develop and implement a technically simple scheme to suppress this noise mechanism by means of quantum interference. Using this scheme with a Raman memory in warm atomic vapor, we demonstrate over an order of magnitude improvement in noise performance. Furthermore we demonstrate a method to quantify the remaining noise contributions and present a route to enable further noise suppression. Our scheme opens the way to quantum demonstrations using a broadband memory, significantly advancing the search for scalable quantum photonic networks.
Text
1905.00042
- Accepted Manuscript
Available under License Other.
More information
Published date: 3 September 2019
Identifiers
Local EPrints ID: 455468
URI: http://eprints.soton.ac.uk/id/eprint/455468
ISSN: 2469-9926
PURE UUID: f93f0a31-175b-4d9e-af8c-2180c195132e
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Date deposited: 22 Mar 2022 17:40
Last modified: 18 Mar 2024 03:58
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Contributors
Author:
S.E. Thomas
Author:
T.M. Hird
Author:
J.H.D. Munns
Author:
B. Brecht
Author:
D.J. Saunders
Author:
J. Nunn
Author:
I.A. Walmsley
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