In recent years, advances in quantum sensors and sensing protocols have continued to generate interest and development into practical quantum sensing in a number of application domains. A potentially impactful application, namely the detection of time-varying signals in noise or clutter, is a crucial component for advanced radar detection systems and surveillance networks. This particular application was recently introduced in a quantum context, along with optimal control protocols to minimize the detection error rates. Here, we experimentally execute this quantum signal detection protocol and show that it remains effective when applied to real-world communications signals that do not meet the assumptions of the original formulation of the protocol, due to their non-Gaussian nature. We also consider another class of signals motivated by pulsed radar, which presents challenges for the quantum signal detection protocol due to their intermittent nature. Despite this, we demonstrate that additional classical processing of the quantum observations may be used to determine the presence of the signal. These results further extend the potential of quantum sensing techniques to operationally relevant, quantum-enhanced receive chains in passive or bistatic sensing scenarios.
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