Protecting Quantum Information with Entanglement and Noisy Optical Modes

TL;DR

This paper introduces a novel continuous-variable quantum error correction method using entanglement, ancilla, and gauge modes, employing linear optical encoding to protect quantum information against noise.

Contribution

It extends the entanglement-assisted operator stabilizer formalism from discrete to continuous-variable quantum information processing.

Findings

Successful integration of active and passive error correction techniques

Implementation of a linear-optical encoding circuit with squeezers and measurements

Enhanced protection of optical quantum information modes

Abstract

We incorporate active and passive quantum error-correcting techniques to protect a set of optical information modes of a continuous-variable quantum information system. Our method uses ancilla modes, entangled modes, and gauge modes (modes in a mixed state) to help correct errors on a set of information modes. A linear-optical encoding circuit consisting of offline squeezers, passive optical devices, feedforward control, conditional modulation, and homodyne measurements performs the encoding. The result is that we extend the entanglement-assisted operator stabilizer formalism for discrete variables to continuous-variable quantum information processing.