Suppressing correlated noise in signals transmitted over the Gaussian memory channels using $2N$-port splitter and phase flips

TL;DR

This paper proposes a linear optical scheme using $2N$-port splitters and phase flips to significantly suppress correlated noise in bosonic Gaussian memory channels, enhancing quantum communication fidelity.

Contribution

It introduces a novel noise suppression scheme employing linear optical elements and phase flips, improving protection of quantum states over noisy channels.

Findings

Correlated noise can be greatly suppressed using the proposed scheme.

Phase flips transform the memory factor from negative to positive in quantum info.

Increasing beam splitters enhances noise suppression efficiency.

Abstract

A scheme for suppressing the correlated noise in signals transmitted over the bosonic Gaussian memory channels is proposed. This is a compromise solution rather than removing the noise completely. The scheme is based on linear optical elements, two $N$-port splitters and $N$ number of phase flips. The proposed scheme has the advantages that the correlated noise of the memory channels are greatly suppressed, and the input signal states can be protected excellently when transmitting over the noise channels. We examine the suppressing efficiency of the scheme for the correlated noise, both from quantum information of the states directly transmitted through the noise channel and also from the entanglement teleportation. The phase flips are very important aspects for the suppressions of the correlated noise, which transform the roles of the memory factor from completely negative to positive in quantum information communications. Increasing the number of beam splitters also can improve the suppressing efficiency of the scheme in communications.