Demonstration of quantum error correction for enhanced sensitivity of photonic measurements

TL;DR

This paper demonstrates a quantum error correction protocol for photonic measurements that recovers nearly 87% of sensitivity regardless of noise rate, surpassing limitations of previous dynamical decoupling methods.

Contribution

It introduces a novel quantum error correction scheme for photonic sensing that does not depend on long noise correlation times, enhancing measurement sensitivity.

Findings

Recovered about 87% of sensitivity

Effective across various noise rates

Proof-of-principle experimental validation

Abstract

The sensitivity of classical and quantum sensing is impaired in a noisy environment. Thus, one of the main challenges facing sensing protocols is to reduce the noise while preserving the signal. State of the art quantum sensing protocols that rely on dynamical decoupling achieve this goal under the restriction of long noise correlation times. We implement a proof-of-principle experiment of a protocol to recover sensitivity by using an error correction for photonic systems that does not have this restriction. The protocol uses a protected entangled qubit to correct a single error. Our results show a recovery of about 87% of the sensitivity, independent of the noise rate.