Nonlinear squeezing generation via multimode PDC and single photon measurement

TL;DR

This paper investigates the generation of nonlinear squeezing in multimode quantum light states using photon-added coherent states, revealing conditions for simultaneous two-mode squeezing and optimal measurement strategies.

Contribution

It introduces a novel protocol for generating nonlinear squeezing in multimode systems with weak non-Gaussianity and analyzes the influence of modal structure and measurement techniques.

Findings

Nonlinear squeezing can be achieved in two modes simultaneously.

Weak non-Gaussianity from single-photon addition suffices for squeezing.

Optimal measurement strategies enhance nonlinear squeezing detection.

Abstract

Nonlinear squeezing is a property of non-Gaussian states of light with an important application in continuous variable quantum computing. We study the generation of nonlinear squeezing in multimode systems produced by the photon-added coherent state technique. We present a protocol and find a regime in which the nonlinear squeezing appears in two modes simultaneously, even for a weak non-Gaussianity induced by the single-photon addition. We explore the properties of nonlinear squeezing depending on the modal structure of light, as well as the seed and local oscillator profiles, and present an optimal measurement strategy.