Affiliation:
1. Academy of Mathematics and Systems Science
2. University of Chinese Academy of Sciences
3. Civil Aviation University of China
4. RIKEN
5. Quantum Computing Center, RIKEN
6. University of Michigan, Ann Arbor
7. Australian National University
Abstract
Unique properties of multimode non-Hermitian lattice dynamics can be utilized to construct exponentially sensitive sensors. However, the impact of noise remains unclear, which may severely degrade their sensitivity. We analytically characterize and highlight the impact of loss and gain on the sensitivity revival and stability of non-Hermitian sensors. Defying the general belief that the superiority of quantum sensing will vanish in the presence of loss, we find that by proactively tuning the loss, the exponential sensitivity can be surprisingly regained when the sensing dynamics is stable. Furthermore, we prove that gain is crucial to fully revive the ideally exponential sensitivity and to ensure the stability of non-Hermitian sensing by making a balanced loss and gain. Our paper opens a way to significantly enhance the sensitivity by proactively tuning the loss and gain, which may promote future quantum sensing and quantum engineering.
Published by the American Physical Society
2024
Funder
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Australian Research Council
Nippon Telegraph and Telephone
Japan Science and Technology Agency
Moonshot Research and Development Program
Asian Office of Aerospace Research and Development
Office of Naval Research
Publisher
American Physical Society (APS)