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A conventional resonant detector is often subject to a trade-off betweenbandwidth and peak sensitivity that can be traced back to quantum Cramer-RaoBound. Anomalous dispersion has been shown to improve it by signalamplification and is thus more robust against decoherence, while it leads toinstabilities. We propose a stable quantum amplifier applicable to linearsystems operating at the fundamental detection limits, enabled by two-modenon-degenerate parametric amplification. At threshold, one mode of theamplifier forms a PT-symmetric system of original detector mode. Sensitivityimprovements are shown for laser-interferometric gravitational-wave detectorsand microwave cavity axion detectors.

Broadband sensitivity improvement via coherent quantum feedback with PT symmetry