On the distillation and purification of phase-diffused squeezed states

TL;DR

This paper investigates experimentally and theoretically how to optimize purification and distillation protocols for phase-diffused squeezed states using Gaussian operations, enhancing quantum state coherence.

Contribution

It provides a detailed analysis of strategies for purification and distillation of phase-diffused squeezed states, focusing on optimization parameters and experimental feasibility.

Findings

Optimal trigger quadrature identified

Trigger threshold value impacts purification efficiency

Protocols effectively counteract phase diffusion decoherence

Abstract

Recently it was discovered that non-Gaussian decoherence processes, such as phase-diffusion, can be counteracted by purification and distillation protocols that are solely built on Gaussian operations. Here, we make use of this experimentally highly accessible regime, and provide a detailed experimental and theoretical analysis of several strategies for purification/distillation protocols on phase-diffused squeezed states. Our results provide valuable information for the optimization of such protocols with respect to the choice of the trigger quadrature, the trigger threshold value and the probability of generating a distilled state.