Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space

Abstract We experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry ov...

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Autores principales:	Tao Chen, Wei Gou, Dizhou Xie, Teng Xiao, Wei Yi, Jun Jing, Bo Yan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/9978bff7ca3a4d9594260624cad756a5
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spelling	oai:doaj.org-article:9978bff7ca3a4d9594260624cad756a52021-12-02T15:49:35ZQuantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space10.1038/s41534-021-00417-y2056-6387https://doaj.org/article/9978bff7ca3a4d9594260624cad756a52021-05-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00417-yhttps://doaj.org/toc/2056-6387Abstract We experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.Tao ChenWei GouDizhou XieTeng XiaoWei YiJun JingBo YanNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Tao Chen Wei Gou Dizhou Xie Teng Xiao Wei Yi Jun Jing Bo Yan Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
description	Abstract We experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.
format	article
author	Tao Chen Wei Gou Dizhou Xie Teng Xiao Wei Yi Jun Jing Bo Yan
author_facet	Tao Chen Wei Gou Dizhou Xie Teng Xiao Wei Yi Jun Jing Bo Yan
author_sort	Tao Chen
title	Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
title_short	Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
title_full	Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
title_fullStr	Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
title_full_unstemmed	Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space
title_sort	quantum zeno effects across a parity-time symmetry breaking transition in atomic momentum space
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9978bff7ca3a4d9594260624cad756a5
work_keys_str_mv	AT taochen quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT weigou quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT dizhouxie quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT tengxiao quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT weiyi quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT junjing quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace AT boyan quantumzenoeffectsacrossaparitytimesymmetrybreakingtransitioninatomicmomentumspace
_version_	1718385706268622848

Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space

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