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5 March 2021 Broadband sensitivity improvement via coherent quantum feedback with PT-symmetry
Xiang Li, Maxim Goryachev, Yiqiu Ma, Michael Tobar, Chunnong Zhao, Rana X. Adhikari, Yanbei Chen
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Proceedings Volume 11700, Optical and Quantum Sensing and Precision Metrology; 117002H (2021) https://doi.org/10.1117/12.2586469
Event: SPIE OPTO, 2021, Online Only
Abstract
A conventional resonant detector is often subject to a trade-off between bandwidth and peak sensitivity. Anomalous dispersion has been shown to improve the bandwidth-sensitivity limit by signal amplification, but its unstable issue in operation needs additional feedback control. Here we propose a stable quantum amplifier enabled by two-mode non-degenerate parametric amplification. As the amplifier operates at threshold, one mode of the amplifier forms a parity-time(PT)-symmetric system with the mode of the original detector, while the other mode of the amplifier collects signal and gets extracted by a readout. Viewed more broadly in the context of coherent quantum control theory, we are attaching a controller that consists of a time reversal of the plant, which, by canceling the inertia of the plant, helps drive up the closed-loop signal gain. Examples of microwave cavity axion detectors and laser-interferometric gravitational-wave detectors will be discussed for this technique.
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Xiang Li, Maxim Goryachev, Yiqiu Ma, Michael Tobar, Chunnong Zhao, Rana X. Adhikari, and Yanbei Chen "Broadband sensitivity improvement via coherent quantum feedback with PT-symmetry", Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 117002H (5 March 2021); https://doi.org/10.1117/12.2586469
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KEYWORDS
Sensors
Amplifiers
Signal detection
Detection theory
Feedback control
Microwave radiation
Quantum physics
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