SPDC-based quantum illumination gives a 3 dB (factor 2) quantum Fisher information advantage over coherent states for Doppler velocity estimation in high thermal noise and low signal photon number.
More specifically, this symmetry of- ten allows one to compute the QFI for a single true value of the parameter and then obtain it for all the other values
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Quantum illumination advantage in quantum Doppler radar
SPDC-based quantum illumination gives a 3 dB (factor 2) quantum Fisher information advantage over coherent states for Doppler velocity estimation in high thermal noise and low signal photon number.