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

Abstract 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 c...

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Autores principales:	Geng-Li Zhang, Di Liu, Man-Hong Yung
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b76ecd0c00cb4c0cbc85d05b1b0e73eb
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spelling	oai:doaj.org-article:b76ecd0c00cb4c0cbc85d05b1b0e73eb2021-12-02T15:39:41ZObservation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit10.1038/s41598-021-93192-x2045-2322https://doaj.org/article/b76ecd0c00cb4c0cbc85d05b1b0e73eb2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93192-xhttps://doaj.org/toc/2045-2322Abstract 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.Geng-Li ZhangDi LiuMan-Hong YungNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Geng-Li Zhang Di Liu Man-Hong Yung Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
description	Abstract 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.
format	article
author	Geng-Li Zhang Di Liu Man-Hong Yung
author_facet	Geng-Li Zhang Di Liu Man-Hong Yung
author_sort	Geng-Li Zhang
title	Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
title_short	Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
title_full	Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
title_fullStr	Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
title_full_unstemmed	Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
title_sort	observation of exceptional point in a pt broken non-hermitian system simulated using a quantum circuit
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b76ecd0c00cb4c0cbc85d05b1b0e73eb
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Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit

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