Experimental Investigation of Lee-Yang Criticality Using Non-Hermitian Quantum System

蓝子桁 ¹刘文权 ²伍旸 ¹叶翔宇 ¹杨哲森 ³段昌奎 ⁴王亚 ⁴荣星⁴

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作者信息

1. CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China
2. CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China
3. Kavli Institute for Theoretical Sciences,Chinese Academy of Sciences,Beijing 100190,China
4. CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China
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Abstract

Lee-Yang theory clearly demonstrates where the phase transition of many-body systems occurs and the asymptotic behavior near the phase transition using the partition function under complex parameters.The complex parameters make the direct investigation of Lee-Yang theory in practical systems challenging.Here we construct a non-Hermitian quantum system that can correspond to the one-dimensional Ising model with imaginary parameters through the equality of partition functions.By adjusting the non-Hermitian parameter,we successfully obtain the partition function under different imaginary magnetic fields and observe the Lee-Yang zeros.We also observe the critical behavior of free energy in vicinity of Lee-Yang zero that is consistent with theoretical prediction.Our work provides a protocol to study Lee-Yang zeros of the one-dimensional Ising model using a single-qubit non-Hermitian system.

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基金项目

国家重点研发计划(2021YFB3202800)

国家自然科学基金(12174373)

中国科学院项目(GJJSTD20200001)

Innovation Program for Quantum Science and Technology(2021ZD0302200)

Anhui Initiative in Quantum Information Technologies(AHY050000)

中国科学院青年创新促进会项目()

中央高校基本科研业务费专项()

Beijing University of Posts and Telecommunications Innovation Group()

出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量23

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