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Broadband sensitivity improvement via coherent quantum feedback with PT symmetry

Li, Xiang; Adhikari, Rana; Adya, Vaishali; Chen, Yanbei; Chen, Yifan; Goryachev, Maxim; Ma, Yiqiu; Shu, Jing; Tobar, Michael; Ward, Robert; Zhao, Chunnong


A conventional resonant detector is subject to a trade-off between bandwidth and peak sensitivity. This limitation can be traced back to the Quantum Cramer Rao Bound and the coherent state of the conventional resonator. The trade-off can be broken by injecting non-classical states (e.g., squeezed vacuum), but it often has stringent requirements on optical losses. Anomalous dispersion due to an unstable quantum system has been shown to be able to improve the bandwidth-sensitivity product by...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Conference paper
Source: Bulletin of the American Physical Society
Access Rights: Free Access via publisher website


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