Robustness of quantum Fourier transform interferometry

TL;DR

This paper investigates how decoherence and noise impact quantum Fourier transform interferometry, demonstrating its robustness for optical phase gradient measurements even under significant noise, with applications involving large matrix permanents.

Contribution

It introduces a novel quantum metrology method using boson sampling networks that remains effective despite phase decoherence and noise.

Findings

Robustness against phase decoherence demonstrated.

Effective gradient measurement with lower order correlations.

Successful estimation of large matrix permanents (up to 100x100).

Abstract

We analyse the effect of decoherence and noise on quantum Fourier transform interferometry, in which a boson sampling photonic network is used to measure optical phase gradients. This novel type of metrology is shown to be robust against phase decoherence. One can also measure gradients using lower order correlations without substantial degradation. Our results involve estimation of up to a 100 x 100 matrix permanent.