Photon-Pair Advantage for Dissipative Parameter Estimation in Whispering-Gallery-Mode Interferometers
We study the estimation of detuning and intrinsic loss in a lossy whispering-gallery-mode (WGM) resonator located in a balanced Mach--Zehnder interferometer. We use indistinguishable photon pairs and coherent-state probes. We show that using indistinguishable photon pairs can provide higher Quantum Fisher Information (...