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We propose and demonstrate a remote sensor scheme by applying the quantummechanical concept of fidelity loss to classical waves. The sensor makesexplicit use of time-reversal invariance and spatial reciprocity in a wavechaotic system to sensitively and remotely measure the presence of smallperturbations. The loss of fidelity is measured through a classical wave-analogof the Loschmidt echo by employing a single-channel time-reversal mirror torebroadcast a probe signal into the perturbed system. We also introduce the useof exponential amplification of the probe signal to partially overcome theeffects of propagation losses and to vary the sensitivity.

Sensor Based on Extending the Concept of Fidelity to Classical Waves