High-Resolution Sensing via Quantum States Discrimination

Abstract

High-resolution sensing plays a significant role in scientific research and industrial production, but the practical implementation is constrained by the physical mechanisms of the sensors. To address the critical limitation, we propose a high-resolution sensing approach based on quantum state discrimination. Distinct from conventional strategies, the proposed approach constructs measurement operators in the orthogonal complement space rather than eigenspace of the eigenstate, thereby notably improving the discriminability among quantum states. Moreover, the experimental results via an optical microcavity demonstrate a potential sensing resolution of 4 $\times$ 10\textsuperscript{-6} \degree C and 18 p$\epsilon$ respectively for temperature and strain, and further verify the feasibility of simultaneous sensing of the two parameters. This work establishs a universal approach for high-resolution sensing, and may be extended to different sensing platforms across various application scenarios.

arXiv commentThis work supports from No.2021ZD0300703 project, failed to complete reporting procedures to project authority. Co-authors Li, Huang and Zeng hold dual affiliations with QSIP and Hefei National Laboratory. The manuscript was not submitted for the required institutional review. The corresponding author Li formally requests withdrawal