Practical advantage of non-Hermitian enhanced quantum sensing

Quantum Physics [Submitted on 21 Mar 2026] Practical advantage of non-Hermitian enhanced quantum sensing Kun Yang, Yaoming Chu, Ning Wang, Jianming Cai Non-Hermitian systems have emerged as a powerful paradigm for ultrasensitive sensing, leveraging unique spectral and dynamical properties that find no counterparts in Hermitian physics. While recent theoretical assessments have established that these protocols offer no fundamental advantage in the ideal shot-noise-limited regime once the success probability of non-unitary evolution is rigorously accounted for, their practical utility under realistic experimental constraints remains largely unexplored. In this work, we shift the focus toward practical laboratory performance by demonstrating that non-Hermitian sensors can significantly outperform their Hermitian counterparts in the presence of various types of technical noise. This enhancement stems from the significantly enhanced susceptibility, which amplifies the signal response to effectively overcome the floor of technical imperfections. By evaluating the Fisher information under different technical noise models, we further substantiate the superior performance of non-Hermitian sensing. Our results delineate the specific regimes where non-Hermitian platforms yield clear practical gains, offering a concrete avenue for building high-precision, noise-resilient sensors. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.20612 [quant-ph]   (or arXiv:2603.20612v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.20612 Focus to learn more Submission history From: Yaoming Chu [view email] [v1] Sat, 21 Mar 2026 03:14:29 UTC (846 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)