Experimental Witness of Quantum Jump Induced High-Order Liouvillian Exceptional Points

• URL: http://arxiv.org/abs/2512.01217v1
• Date: Mon, 01 Dec 2025 02:56:52 GMT
• Title: Experimental Witness of Quantum Jump Induced High-Order Liouvillian Exceptional Points
• Authors: Zhuo-Zhu Wu, Pei-Dong Li, Tai-Hao Cui, Jia-Wei Wang, Yuan-Zhang Dong, Shuang-Qing Dai, Ji Li, Ya-Qi Wei, Quan Yuan, Xiao-Ming Cai, Liang Chen, Jian-Qi Zhang, Hui Jing, Mang Feng,
• Abstract summary: The Liouvillian exceptional point (LEP) has recently drawn much attention due to capability to fully capture quantum system dynamics.<n>We report the first observation of third-order LEPs emerging from quantum jumps in an ultracold two-level quantum system.<n>This unique feature of non-Hermitian quantum systems paves a new avenue for modifying nonreciprocity, enhancing precision measurement, and manipulating topological dynamics.
• Score: 12.321902370598046
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The exceptional point has presented considerably interesting and counterintuitive phenomena associated with nonreciprocity, precision measurement, and topological dynamics. The Liouvillian exceptional point (LEP), involving the interplay of energy loss and decoherence inherently relevant to quantum jumps, has recently drawn much attention due to capability to fully capture quantum system dynamics and naturally facilitate non-Hermitian quantum investigations. It was also predicted that quantum jumps could give rise to third-order LEPs in two-level quantum systems for its high dimensional Liouvillian superoperator, which, however, has never been experimentally confirmed until now. Here we report the first observation of the third-order LEPs emerging from quantum jumps in an ultracold two-level trapped-ion system. Moreover, by combining decay with dephasing processes, we present the first experimental exploration of LEPs involving combinatorial effect of decay and dephasing. In particular, due to non-commutativity between the Lindblad superoperators governing LEPs for decay and dephasing, we witness the movement of LEPs driven by the competition between decay and dephasing occurring in an open quantum system. This unique feature of non-Hermitian quantum systems paves a new avenue for modifying nonreciprocity, enhancing precision measurement, and manipulating topological dynamics by tuning the LEPs.

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