- By:
- Marino Valle, Alberto M; Feldman, Matthew A; Marvinney, Claire E; Pooser, Raphael C; Hong, Seongjin; Febbraro, Michael T; Lee, Donghwa; Lee, Changhyeop
- Journal Name:
- Physical Review Research
- Page Number:
- 23231
- Volume:
- 7
- Issue Number:
- 2
- Publication Date:
- June 10, 2025
- View DOI Listing:
- https://doi.org/10.1103/PhysRevResearch.7.023231
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. Specifically, we show a quantum noise reduction of 1.7±0.3 dB below what is possible with the corresponding classical configuration. 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.
