Remote Phase Sensing by Coherent Single Photon Addition. Issue 12 (11th October 2022) - Biagi, Nicola
Abstract: A remote phase sensing scheme is proposed, inspired by the high sensitivity of the entanglement produced by coherent multimode photon addition on the phase set in the remote heralding apparatus. By exploring the case of delocalized photon addition over two modes containing identical coherent states, the optimal observable to perform remote phase estimation from heralded quadrature measurements is derived. The technique is experimentally tested with calibration measurements and then used for estimating a remote phase with a sensitivity that is found to scale with the intensity of the local coherent states, which never interacted with the sample. Abstract : A new kind of remote phase estimation technique is introduced, based on the delocalized addition of a single photon onto distinct field modes. Exploiting the strong dependence of the heralded state on the phase set in a remote heralding station, the scheme is experimentally shown to achieve a sensitivity that scales with the intensity of light that never interacted with a distant sample.