Quantum sensing utilizing unique quantum properties of non-Hermitian systems to realize ultra-precision measurements has been attracting increasing attention. However, the debate on whether non-Hermitian systems are superior to Hermitian counterparts in sensing remains an open question. Here, we investigate the quantum information in PT-symmetric quantum sensing utilizing two experimental schemes based on the trapped-ion platform. It turns out that the existence of advantages of non-Hermitian quantum sensing heavily depends on additional information resources carried by the extra degrees of freedom introduced to construct PT-symmetric quantum sensors. Moreover, the practical application of non-Hermitian quantum sensing with superior performance is primarily restricted by the additional resource consumption accompanied by the post-selection. Our study provides theoretical references for the construction of non-Hermitian quantum sensors with superior performance and has potential applications in research fields of quantum precision measurement and quantum information processing.
Quantum Advantage in Distributed Sensing with Noisy Quantum Networks
Pritzker School of Molecular Engineering, University of Chicago（芝加哥大学普里茨克分子工程学院）；Mathematics and Computer Science Division, Argonne National Laboratory（阿贡国家实验室数学与计算机科学部）；Data Science and Learning Division, Argonne National Laboratory（阿贡国家实验室数据科学与学习部）；Center for Nanoscale Materials, Argonne National Laboratory（阿贡国家实验室纳米材料中心）
Robustness- and weight-based resource measures without convexity restriction: Multicopy witness and operational advantage in static and dynamical quantum resource theories
Exponential entanglement advantage in sensing correlated noise
Joint Center for Quantum Information and Computer Science, NIST/University of Maryland（量子信息与计算机科学联合中心，美国国家标准与技术研究院/马里兰大学）；Department of Physics, Harvard University（哈佛大学物理系）；Joint Quantum Institute, NIST/University of Maryland（量子信息联合研究所，美国国家标准与技术研究院/马里兰大学）；IBM Quantum, IBM T.J. Watson Research Center（IBM量子，IBM托马斯·J·沃森研究中心）；Department of Physics, Korea Advanced Institute of Science and Technology（韩国科学技术院物理系）
Entanglement advantage in sensing power-law spatiotemporal noise correlations
Joint Center for Quantum Information and Computer Science, NIST/University of Maryland（量子信息与计算机科学联合中心，美国国家标准与技术研究院/马里兰大学）；Joint Quantum Institute, NIST/University of Maryland（量子联合研究所，美国国家标准与技术研究院/马里兰大学）；Pritzker School of Molecular Engineering, University of Chicago（普里茨克分子工程学院，芝加哥大学）
Recovering optimal precision in quantum sensing with time domain imperfections
The University of Hong Kong（香港大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Shenzhen University（深圳大学）；Southern University of Science and Technology（南方科技大学）
Comment on J.Qin et al., Unconditional and Robust Quantum Metrological Advantage beyond N00N States, PRL 130, 070801 (2023) and J.A. H. Nielsen et.al., Deterministic Quantum Phase Estimation beyond N00N States. PRL 130, 123603 (2023)
Sorbonne Université, CNRS, LIP6（索邦大学，法国国家科学研究中心，LIP6）；Welinq；Instituto Superior Técnico, Universidade de Lisboa（里斯本大学高等技术学院）；Centro de Física e Engenharia de Materiais Avançados (CeFEMA)（先进材料与工程物理中心）；PQI – Portuguese Quantum Institute（葡萄牙量子研究所）；Universiteit Leiden（莱顿大学）
Chernoff Information Bottleneck for Covert Quantum Target Sensing
Dipartimento di Fisica e Astronomia, Università di Firenze（佛罗伦萨大学物理与天文系）；Istituto Nazionale di Fisica Nucleare, Sezione di Firenze（意大利国家核物理研究所佛罗伦萨分部）；Quantum metrology and nano technologies division, INRiM（INRiM量子计量与纳米技术部）
Quantum-enhanced sensing in a driven-dissipative system via chiral waveguide
Nanyang Technological University（南洋理工大学）；National University of Singapore（新加坡国立大学）；University of Electronic Science and Technology of China（电子科技大学）；National Institute of Education, Nanyang Technological University（南洋理工大学国立教育学院）；Tianfu Jiangxi Laboratory（天府江西实验室）；Singapore University of Technology and Design（新加坡科技设计大学）
