Continuous Protection of a Collective State from Inhomogeneous Dephasing

We introduce and demonstrate a scheme for eliminating the inhomogeneous dephasing of a collective quantum state. The scheme employs off-resonant fields that continuously dress the collective state with an auxiliary sensor state, which has an enhanced and opposite sensitivity to the same source of in...

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Autores principales:	R. Finkelstein, O. Lahad, I. Cohen, O. Davidson, S. Kiriati, E. Poem, O. Firstenberg
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/b240b4dfb349433b85b6b7fc6fb5576a
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spelling	oai:doaj.org-article:b240b4dfb349433b85b6b7fc6fb5576a2021-12-02T14:26:23ZContinuous Protection of a Collective State from Inhomogeneous Dephasing10.1103/PhysRevX.11.0110082160-3308https://doaj.org/article/b240b4dfb349433b85b6b7fc6fb5576a2021-01-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.011008http://doi.org/10.1103/PhysRevX.11.011008https://doaj.org/toc/2160-3308We introduce and demonstrate a scheme for eliminating the inhomogeneous dephasing of a collective quantum state. The scheme employs off-resonant fields that continuously dress the collective state with an auxiliary sensor state, which has an enhanced and opposite sensitivity to the same source of inhomogeneity. We derive the optimal conditions under which the dressed state is fully protected from dephasing when using either one or two dressing fields. The latter provides better protection, circumvents qubit phase rotation, and suppresses the sensitivity to drive noise. We further derive expressions for all residual, higher-order sensitivities. We experimentally study the scheme by protecting a collective excitation of an atomic ensemble, where inhomogeneous dephasing originates from thermal motion. Using photon storage and retrieval, we demonstrate complete suppression of inhomogeneous dephasing and, consequently, a prolonged memory time. Our scheme may be applied to eliminate motional dephasing in other systems, improving the performance of quantum gates and memories with neutral atoms. It is also generally applicable to various gas, solid, and engineered systems, where sensitivity to variations in time, space, or other domains limits possible scale-up of the system.R. FinkelsteinO. LahadI. CohenO. DavidsonS. KiriatiE. PoemO. FirstenbergAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 1, p 011008 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 R. Finkelstein O. Lahad I. Cohen O. Davidson S. Kiriati E. Poem O. Firstenberg Continuous Protection of a Collective State from Inhomogeneous Dephasing
description	We introduce and demonstrate a scheme for eliminating the inhomogeneous dephasing of a collective quantum state. The scheme employs off-resonant fields that continuously dress the collective state with an auxiliary sensor state, which has an enhanced and opposite sensitivity to the same source of inhomogeneity. We derive the optimal conditions under which the dressed state is fully protected from dephasing when using either one or two dressing fields. The latter provides better protection, circumvents qubit phase rotation, and suppresses the sensitivity to drive noise. We further derive expressions for all residual, higher-order sensitivities. We experimentally study the scheme by protecting a collective excitation of an atomic ensemble, where inhomogeneous dephasing originates from thermal motion. Using photon storage and retrieval, we demonstrate complete suppression of inhomogeneous dephasing and, consequently, a prolonged memory time. Our scheme may be applied to eliminate motional dephasing in other systems, improving the performance of quantum gates and memories with neutral atoms. It is also generally applicable to various gas, solid, and engineered systems, where sensitivity to variations in time, space, or other domains limits possible scale-up of the system.
format	article
author	R. Finkelstein O. Lahad I. Cohen O. Davidson S. Kiriati E. Poem O. Firstenberg
author_facet	R. Finkelstein O. Lahad I. Cohen O. Davidson S. Kiriati E. Poem O. Firstenberg
author_sort	R. Finkelstein
title	Continuous Protection of a Collective State from Inhomogeneous Dephasing
title_short	Continuous Protection of a Collective State from Inhomogeneous Dephasing
title_full	Continuous Protection of a Collective State from Inhomogeneous Dephasing
title_fullStr	Continuous Protection of a Collective State from Inhomogeneous Dephasing
title_full_unstemmed	Continuous Protection of a Collective State from Inhomogeneous Dephasing
title_sort	continuous protection of a collective state from inhomogeneous dephasing
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/b240b4dfb349433b85b6b7fc6fb5576a
work_keys_str_mv	AT rfinkelstein continuousprotectionofacollectivestatefrominhomogeneousdephasing AT olahad continuousprotectionofacollectivestatefrominhomogeneousdephasing AT icohen continuousprotectionofacollectivestatefrominhomogeneousdephasing AT odavidson continuousprotectionofacollectivestatefrominhomogeneousdephasing AT skiriati continuousprotectionofacollectivestatefrominhomogeneousdephasing AT epoem continuousprotectionofacollectivestatefrominhomogeneousdephasing AT ofirstenberg continuousprotectionofacollectivestatefrominhomogeneousdephasing
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Continuous Protection of a Collective State from Inhomogeneous Dephasing

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