Quantum Sensing with Bright Two-Mode Squeezed Light in a Distributed Network of Gyroscopes

TL;DR

This paper proposes a quantum-enhanced distributed sensing scheme using bright two-mode squeezed light to improve the accuracy of angular velocity estimation in optical gyroscopes within quantum networks.

Contribution

It introduces a novel configuration leveraging continuous-variable entanglement across multiple gyroscopes for enhanced global phase shift estimation.

Findings

Achieves ~9.3 dB sensitivity enhancement beyond shot-noise limit with 5% photon loss.

Analyzes phase sensitivities of different bTMSS configurations using quantum Cramér-Rao bound.

Demonstrates potential for quantum-enhanced inertial navigation and precision metrology.

Abstract

Recent developments in quantum technologies have enabled significant improvements in the precision of optical sensing systems. This work explores the integration of distributed quantum sensing (DQS) with optical gyroscopes to improve the estimation accuracy of angular velocity. Utilizing bright two-mode squeezed states (bTMSS), which offer high photon numbers and strong bipartite quantum correlations, we propose a novel configuration that leverages continuous-variable entanglement across multiple spatially separated optical gyroscopes. Unlike traditional quantum sensing that enhances a single sensor, our approach focuses on estimating a global phase shift corresponding to the average angular rotation across distributed optical gyroscopes with quantum-enhanced sensitivity. We analyze the phase sensitivities of different bTMSS configurations, including M mode-entangled bTMSS and separable M-bTMSS, and evaluate their performance through the quantum Cram\'er-Rao bound. The analysis shows that, with 5% photon loss in every channel in the system, the proposed scheme shows a sensitivity enhancement of ~9.3 dB beyond the shot-noise limit, with an initial squeezing of ~9.8 dB. The present scheme has potential applications in quantum-enhanced inertial navigation and precision metrology within emerging quantum networks.