PT-symmetric quantum sensing: advantages and restrictions
Abstract
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.
Cite
@article{arxiv.2312.07892,
title = {PT-symmetric quantum sensing: advantages and restrictions},
author = {Yan-Yi Wang and Chun-Wang Wu and Wei Wu and Ping-Xing Chen},
journal= {arXiv preprint arXiv:2312.07892},
year = {2023}
}
Comments
16 pages, 7 figures