Broadband sensitivity improvement via coherent quantum feedback with PT symmetry

• URL: http://arxiv.org/abs/2012.00836v1
• Date: Tue, 1 Dec 2020 21:27:14 GMT
• Title: Broadband sensitivity improvement via coherent quantum feedback with PT symmetry
• Authors: Xiang Li, Maxim Goryachev, Yiqiu Ma, Michael E. Tobar, Chunnong Zhao, Rana X Adhikari, Yanbei Chen
• Abstract summary: We propose a stable quantum amplifier applicable to linear systems operating at the fundamental detection limits. Sensitivity improvements are shown for laser-interferometric gravitational-wave detectors and microwave cavity axion detectors.
• Score: 9.717134926446956
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A conventional resonant detector is often subject to a trade-off between bandwidth and peak sensitivity that can be traced back to quantum Cramer-Rao Bound. Anomalous dispersion has been shown to improve it by signal amplification and is thus more robust against decoherence, while it leads to instabilities. We propose a stable quantum amplifier applicable to linear systems operating at the fundamental detection limits, enabled by two-mode non-degenerate parametric amplification. At threshold, one mode of the amplifier forms a PT-symmetric system of original detector mode. Sensitivity improvements are shown for laser-interferometric gravitational-wave detectors and microwave cavity axion detectors.

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