Analysis of Aharonov-Bohm effect due to time-dependent vector potentials

We analyze and propose a method to detect the Aharonov-Bohm effect due to time-varying vector potentials, specifically those arising from a coherent light source. We show that the effect is feasible for use as a light-intensity detector. The quantum limit of detection is that of a single photon. Such a system would be a quantum-nondemolition measurement since no photon absorption occurs.