高维宇称-时间对称系统中的信息恢复与临界性

曲登科; 范毅; 薛鹏

doi:10.7498/aps.70.20220511

摘要

近期, 满足宇称-时间对称性的非厄米系统的研究取得了令人印象深刻的进展, 如物理系统拓扑性质和奇异点处临界性的观测. 宇称-时间对称的非幺正动力学的一个至关重要的方面就是系统与环境之间的信息流动. 本文利用量子态间的可区分性这一物理量, 统一量化了低维与高维宇称-时间对称的非厄米系统和环境之间的信息流动. 数值计算结果表明, 在宇称-时间对称性保持的相区域可以观测到量子态间可区分性的振荡以及完全的信息恢复. 然而在宇称时间对称性破坏的相区域, 信息处于指数衰减的状态. 奇异点处标志着信息流动的可逆与不可逆的临界性, 量子态间的可区分性表现出幂律衰减的行为. 理解非幺正量子动力学中的这些独特的现象为研究开放量子系统提供了重要视角, 并且有助于其在量子信息中的应用.

关键词:

Abstract

Recently, impressive progress has been made in the study of non-Hermitian systems with parity-time symmetry, such as observations of topological properties of physical systems and criticality at exceptional points. A crucial aspect of parity-time symmetric nonunitary dynamics is the information flow between the system and the environment. In this paper, we use the physical quantity, distinguishability between quantum states, to uniformly quantify the information flow between low-dimensional and high-dimensional parity-time symmetric non-Hermitian systems and environments. The numerical results show that the oscillation of quantum state distinguishability and complete information retrieval and can be obtained in the parity-time-unbroken phase. However, the information decays exponentially in the parity-time-broken phase. The exceptional point marks the criticality between reversibility and irreversibility of information flow, and the distinguishability between quantum states exhibits the behavior of power-law decay. Understanding these unique phenomena in nonunitary quantum dynamics provides an important perspective for the study of open quantum systems and contributes to their application in quantum information.

Keywords:

作者及机构信息

1.
东南大学物理学院, 南京　211189

2.
北京计算科学研究中心, 北京　100084

3.
中国人民解放军陆军步兵学院, 石家庄　050083

通信作者: 曲登科, dkqu@seu.edu.cn ; 薛鹏, gnep.eux@gmail.com

基金项目: 国家杰出青年科学基金(批准号: 12025401)和国家自然科学基金(批准号: U1930402, 12088101)资助的课题

Authors and contacts

1.
Department of Physics, Southeast University, Nanjing 211189, China

2.
Beijing Computational Science Research Center, Beijing 100084, China

3.
The Army Infantry Academy of PLA, Shijiazhuang 050083, China

Corresponding author: Qu Deng-Ke, dkqu@seu.edu.cn ; Xue Peng, gnep.eux@gmail.com

Funds: Project supported by the National Science Fund for Distinguished Young Scholars of China (Grant No. 12025401) and the National Natural Science Foundation of China (Grant Nos. U1930402, 12088101)

文章全文 : translate this paragraph

参考文献

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施引文献

图 1 在宇称-时间对称的两能级系统的信息流动　(a), (b) 在宇称-时间对称保持的区域($0<a<1$), 量子态的可区分性表现出周期性振荡, 当逐渐靠近奇异点($a=1$)时, 信息恢复的周期会变长; (c) 在宇称-时间对称性被破坏的区域($a > $$ 1$), 量子态的可区分性在一直在衰减

Fig. 1. Information flow in the parity-time-symmetric two-level system: (a), (b) The distinguishability oscillates with period in the parity-time-unbroken phase ($0<a<1$). When approaching the exceptional point ($a=1$), the period of the information retrieval. (c) The distinguishability between quantum states is declining in the parity-time-symmetry-broken regime ($a>1$)

下载: 全尺寸图片幻灯片

图 2 在宇称-时间对称的两能级系统在奇异点处($a=1$), 量子态的可区分性的幂律行为

Fig. 2. Power-law behavior of the distinguishability of the parity-time-symmetric system at the exceptional point $a=1$

下载: 全尺寸图片幻灯片

图 3 宇称-时间对称的四能级系统的信息流动　(a), (b) 在宇称-时间对称保持的区域($\gamma<J$), 量子态的可区分性表现出周期性振荡, 当逐渐靠近奇异点($\gamma=J$)时, 信息恢复的周期会变长; (c) 在宇称-时间对称性被破坏的区域($\gamma> $$ J$), 量子态的可区分性在一直在衰减

Fig. 3. Information flow in the parity-time-symmetric four-level system: (a), (b) The distinguishability oscillates with period in the parity-time-unbroken phase ($\gamma<J$). When approaching the exceptional point ($\gamma=J$), the period of the information retrieval. (c) The distinguishability between quantum states is declining in the parity-time-symmetry-broken regime ($\gamma>J$)

下载: 全尺寸图片幻灯片

图 4 在宇称-时间对称的四能级系统在奇异点处($\gamma=J$), 量子态的可区分性的幂律行为.

Fig. 4. Power-law behavior of the distinguishability of the parity-time-symmetric system at the exceptional point $\gamma=J$.

下载: 全尺寸图片幻灯片

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[2]	Zou D, Chen T, He W, et al. 2021 Nat. Commun. 12 7201 Google Scholar
[3]	Wu T, Zhang W, Zhang H, et al. 2020 Phys. Rev. Lett. 124 083901 Google Scholar
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[17]	Lin G, Zhang S, Hu Y, Niu Y, Gong J, Gong S 2019 Phys. Rev. Lett. 123 033902 Google Scholar
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[41]	Bian Z, Xiao L, Wang K, et al. 2020 Phys. Rev. A 102 030201(R Google Scholar
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[49]	Facchi P, Pascazio S 2002 Phys. Rev. Lett. 89 080401 Google Scholar
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[51]	Viola L, Knill E, Lloyd S 1999 Phys. Rev. Lett. 82 2417 Google Scholar
[52]	Viola L, Lloyd S, Knill E 1999 Phys. Rev. Lett. 83 4888 Google Scholar
[53]	Palma G M, Suominen K A, Ekert A K 1996 Proc. R. Soc. A 452 567 Google Scholar
[54]	Zanardi P, Rasetti M 1997 Phys. Rev. Lett. 79 3306 Google Scholar
[55]	Duan L M, Guo G C 1998 Phys. Rev. A 57 737 Google Scholar
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[57]	Lidar D A, Bacon D, Whaley K B 1999 Phys. Rev. Lett. 82 4556 Google Scholar
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[59]	Beige A, Braun D, Tregenna B, Knight P L 2000 Phys. Rev. Lett. 85 1762 Google Scholar
[60]	Brody D C, Graefe E M 2012 Phys. Rev. Lett. 109 230405 Google Scholar
[61]	Nielsen M A, Chuang I L 2010 Quantum Computation and Quantum Information (New York: Cambridge University Press) pp403–409
[62]	Fuchs C A, van de Graaf J 1999 IEEE Trans. Inf. Theory 45 1216 Google Scholar
[63]	Gilchrist A, Langford N K, Nielsen M A 2005 Phys. Rev. A 71 062310 Google Scholar
[64]	Ruskai M B 1994 Rev. Math. Phys. 06 1147 Google Scholar
[65]	Erez N, Gordon G, Nest M, Kurizki G 2008 Nature 452 724 Google Scholar
[66]	Wolf M M, Eisert J, Cubitt T S, Cirac J I 2008 Phys. Rev. Lett. 101 150402 Google Scholar
[67]	Breuer H P, Laine E M, Piilo J 2009 Phys. Rev. Lett. 103 210401 Google Scholar
[68]	Laine E M, Piilo J, Breuer H P 2010 Phys. Rev. A 81 062115 Google Scholar
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[70]	Luo A, Fu S, Song H 2012 Phys. Rev. A 86 044101 Google Scholar
[71]	Chruściński D, Maniscalco S 2014 Phys. Rev. Lett. 112 120404 Google Scholar
[72]	Chruściński D, Macchiavello C, Maniscalco S 2017 Phys. Rev. Lett. 118 080404 Google Scholar
[73]	Breuer H P, Laine E M, Piilo J, Vacchini B 2016 Rev. Mod. Phys. 88 021002 Google Scholar
[74]	Wolf M M, Cirac J I 2008 Commun. Math. Phys. 279 147 Google Scholar
[75]	Hou S C, Yi X X, Yu S X, Oh C H 2011 Phys. Rev. A 83 062115 Google Scholar
[76]	Lu X M, Wang X, Sun C P 2010 Phys. Rev. A 82 042103 Google Scholar
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[78]	Lorenzo S, Plastina F, Paternostro M 2013 Phys. Rev. A 88 020102 Google Scholar
[79]	Tang J S, Wang Y T, Yu S, et al. 2016 Nat. Photonics 10 642 Google Scholar
[80]	Hodaei H, Hassan A U, Wittek S, et al. 2017 Nature 548 187 Google Scholar
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[82]	Quiroz-Juárez M A, Perez-Leija A, Tschernig K, et al. 2019 Photonics Res. 7 862 Google Scholar
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[86]	Zhan X, Xiao L, Bian Z, et al. 2017 Phys. Rev. Lett. 119 130501 Google Scholar
[87]	Xiao L, Deng T S, Wang K, et al. 2020 Nat. Phys. 16 761 Google Scholar
[88]	Klauck F, Teuber L, Ornigotti M, Heinrich M, Scheel S, Szameit A 2019 Nat. Photonics 13 883 Google Scholar
[89]	Naghiloo M, Abbasi M, Joglekar Y N, Murch K W 2019 Nat. Phys. 19 1232
[90]	Zhan X, Wang K, Xiao L, et al. 2020 Phys. Rev. A 101 010302(R Google Scholar
[91]	Xue P 2022 Chin. Phys. B 31 010311 Google Scholar
[92]	Xue P, Sanders B C, Leibfried D 2009 Phys. Rev. Lett. 103 183602 Google Scholar
[93]	Wang K, Xiao L, Budich J C, Yi W, Xue P 2021 Phys. Rev. Lett. 127 026404 Google Scholar
[94]	Wang K, Li T, Xiao L, Han Y, Yi W, Xue P 2021 Phys. Rev. Lett. 127 270602 Google Scholar
[95]	Wang X, Xiao L, Qiu X, Wang K, Yi W, Xue P 2018 Phys. Rev. A 98 013835 Google Scholar
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