Phase estimation of definite photon number states by using quantum circuits

Abstract

We propose a method to map the conventional optical interferometry setup into quantum circuits. The unknown phase shift inside a Mach-Zehnder interferometer in the presence of photon loss is estimated by simulating the quantum circuits. For this aim, we use the Bayesian approach in which the likelihood functions are needed, and they are obtained by simulating the appropriate quantum circuits. The precision of four different definite photon-number states of light, which all possess six photons, is compared. In addition, the fisher information for the four definite photon-number states in the setup is also estimated to check the optimality of the chosen measurement scheme.

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

“…However, the measurement process itself can also cause decoherence and consequently reduce the accuracy of the quantum parameter estimation outcome. Increasing the degree of sensitivity and accuracy of quantum parameter estimation, exploiting quantum properties, is the primary purpose of quantum metrology [34,35]. In recent years, this research line has been under the spotlight owing to its profound impact on quantum technology [36].…”