Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit

Zhang, Geng-Li1,2,3; Liu, Di4,5; Yung, Man-Hong1,6,7,8

2021-07-05

10.1038/s41598-021-93192-x

Scientific Reports   影响因子和分区

2045-2322

Exceptional points (EPs), the degeneracy points of non-Hermitian systems, have recently attracted great attention because of their potential of enhancing the sensitivity of quantum sensors. Unlike the usual degeneracies in Hermitian systems, at EPs, both the eigenenergies and eigenvectors coalesce. Although EPs have been widely explored, the range of EPs studied is largely limited by the underlying systems, for instance, higher-order EPs are hard to achieve. Here we propose an extendable method to simulate non-Hermitian systems and study EPs with quantum circuits. The system is inherently parity-time (PT) broken due to the non-symmetric controlling effects of the circuit. Inspired by the quantum Zeno effect, the circuit structure guarantees the success rate of the post-selection. A sample circuit is implemented in a quantum programming framework, and the phase transition at EP is demonstrated. Considering the scalable and flexible nature of quantum circuits, our model is capable of simulating large-scale systems with higher-order EPs.

SCI

英语

通讯

Natural Science Foundation of Guangdong Province[2017B030308003] ; Key R&D Program of Guangdong province[2018B030326001] ; Science, Technology and Innovation Commission of Shenzhen Municipality["JCYJ20170412152620376","JCYJ20170817105046702","KYTDPT20181011104202253"] ; National Natural Science Foundation of China[11875160,"U1801661"] ; Economy, Trade and Information Commission of Shenzhen Municipality[201901161512] ; Guangdong Provincial Key Laboratory[2019B121203002]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000672613500001

NATURE RESEARCH

Web of Science

1.Cent Res Inst, Huawei Technol, Shenzhen 518129, Peoples R China
2.Chinese Univ Hong Kong, Dept Phys, Shatin,N T, Hong Kong, Peoples R China
3.Chinese Univ Hong Kong, Ctr Quantum Coherence, Shatin,N T, Hong Kong, Peoples R China
4.Univ Sci & Technol China, Key Lab Quantum Informat, CAS, Hefei 230026, Anhui, Peoples R China
5.Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum, Hefei 230026, Anhui, Peoples R China
6.Southern Univ Sci & Technol, Dept Phys, Shenzhen, Peoples R China
7.Shenzhen Inst Quantum Sci & Engn, Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China
8.Shenzhen Inst Quantum Sci & Engn, Southern Univ Sci & Technol, Guangdong Prov Key Lab Quantum Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Zhang, Geng-Li,Liu, Di,Yung, Man-Hong. Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit[J]. Scientific Reports,2021,11(1).

Zhang, Geng-Li,Liu, Di,&Yung, Man-Hong.(2021).Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit.Scientific Reports,11(1).

Zhang, Geng-Li,et al."Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit".Scientific Reports 11.1(2021).