Quantum enhanced distributed phase sensing with a truncated SU(1,1) interferometer
Abstract
In recent years, distributed quantum sensing has gained interest for a range of applications requiring networks of sensors, from global-scale clock synchronization to high energy physics. In particular, a network of entangled sensors can improve not only the sensitivity beyond the shot noise limit, but also enable a Heisenberg scaling with the number of sensors. Here, using bright entangled twin beams, we theoretically and experimentally demonstrate the detection of a linear combination of two distributed phases beyond the shot noise limit with a truncated SU(1,1) interferometer. We experimentally demonstrate a quantum noise reduction of 1.7 dB and a classical 3 dB signal-to-noise ratio improvement over the separable sensing approach involving two truncated SU(1,1) interferometers. Additionally, we theoretically extend the use of a truncated SU(1,1) interferometer to a multi-phase-distributed sensing scheme that leverages entanglement as a resource to achieve a quantum improvement in the scaling with the number of sensors in the network. Our results pave the way for developing quantum enhanced sensor networks that can achieve an entanglement-enhanced sensitivity.
Cite
@article{arxiv.2403.17119,
title = {Quantum enhanced distributed phase sensing with a truncated SU(1,1) interferometer},
author = {Seongjin Hong and Matthew A. Feldman and Claire E. Marvinney and Donghwa Lee and Changhyoup Lee and Michael T. Febbraro and Alberto M. Marino and Raphael C. Pooser},
journal= {arXiv preprint arXiv:2403.17119},
year = {2025}
}