Influence of modal loss on the quantum state generation via cross-Kerr nonlinearity

TL;DR

This paper examines how different types of losses affect the creation of non-classical quantum states via cross-Kerr nonlinearity, highlighting conditions where quantum features are preserved or enhanced despite decoherence.

Contribution

It provides a detailed analysis of decoherence effects on quantum state generation through cross-Kerr interactions, including the impact of correlated losses and the distinction between generation and propagation losses.

Findings

Losses can be tolerated within certain parameter regions without destroying non-classicality.

Correlated losses may enhance non-classical features in large cross-Kerr schemes.

Differences between effects of losses during state generation versus propagation are identified.

Abstract

In this work we investigate an influence of decoherence effects on quantum states generated as a result of the cross-Kerr nonlinear interaction between two modes. For Markovian losses (both photon loss and dephasing), a region of parameters when losses still do not lead to destruction of non-classicality is identified. We emphasize the difference in impact of losses in the process of state generation as opposed to those occurring in propagation channel. We show moreover, that correlated losses in modern realizations of schemes of large cross-Kerr nonlinearity might lead to enhancement of non-classicality.