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Nonreciprocal Quantum Sensing
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abstract
Nonreciprocity can not only generate quantum resources, but also shield noise and reverse interference from driving signals. We investigate the advantages of nonreciprocal coupling in sensing a driving signal. In general, we find that the nonreciprocal coupling performs better than the corresponding reciprocal coupling. And we show that homodyne measurement is the optimal measurement. A single non-reciprocal coupling can increase measurement precision up to 2 times. Using $N$ non-reciprocal couplings in parallel, the measurement precision can be improved by $N^2$ times compared with the corresponding reciprocal coupling. In a non-zero temperature dissipative environment, we demonstrate that the nonreciprocal quantum sensing has better robustness to thermal noise than the reciprocal quantum sensing.
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Quantum Sensing with Driven-Dissipative Su-Schrieffer-Heeger Lattices
An odd-site squeezed SSH resonator chain yields exponentially growing, photon-normalized SNR for on-site and NHSE perturbations with a single drive, saturating beyond the linear response regime at a size-independent bound.
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