Experimentally feasible quantum erasure-correcting code for continuous variables

TL;DR

This paper introduces a practical continuous-variable quantum erasure-correcting code that protects quantum states of light from losses, enabling near-perfect recovery when erasures are detectable and offering an efficient filtration scheme with postselection.

Contribution

It presents the first experimentally feasible quantum erasure-correcting code for continuous variables, combining loss protection with potential for perfect recovery and erasure filtration.

Findings

First continuous-variable quantum erasure-correcting code proposed.

Protocol can achieve near-perfect recovery of quantum states.

Feasibility analysis supports experimental implementation.

Abstract

We devise a scheme that protects quantum coherent states of light from probabilistic losses, thus achieving the first continuous-variable quantum erasure-correcting code. If the occurrence of erasures can be probed, then the decoder enables, in principle, a perfect recovery of the original light states. Otherwise, if supplemented with postselection based on homodyne detection, this code can be turned into an efficient erasure-filtration scheme. The experimental feasibility of the proposed protocol is carefully addressed.