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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2021-05-01
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Online Access: | https://doi.org/10.1038/s41534-021-00417-y |
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doaj-9978bff7ca3a4d9594260624cad756a52021-05-30T11:48:53ZengNature Publishing Groupnpj Quantum Information2056-63872021-05-01711610.1038/s41534-021-00417-yQuantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum spaceTao Chen0Wei Gou1Dizhou Xie2Teng Xiao3Wei Yi4Jun Jing5Bo Yan6Interdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang UniversityInterdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang UniversityInterdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang UniversityInterdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang UniversityCAS Key Laboratory of Quantum Information, University of Science and Technology of ChinaDepartment of Physics, Zhejiang UniversityInterdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang UniversityAbstract 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.https://doi.org/10.1038/s41534-021-00417-y |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tao Chen Wei Gou Dizhou Xie Teng Xiao Wei Yi Jun Jing Bo Yan |
spellingShingle |
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 npj Quantum Information |
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 Publishing Group |
series |
npj Quantum Information |
issn |
2056-6387 |
publishDate |
2021-05-01 |
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. |
url |
https://doi.org/10.1038/s41534-021-00417-y |
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