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.
| Original language | English |
|---|---|
| Article number | 023231 |
| Journal | Physical Review Research |
| Volume | 7 |
| Issue number | 2 |
| DOIs | |
| State | Published - Apr 2025 |
Funding
S.H., R.C.P., M.T.F., and M.A.F. were supported by the U.S. DOE Office of Science, Office of High Energy Physics, QuantISED program (under Grant No. FWP ERKAP63). A.M.M. and C.E.M. received support from the U.S. DOE, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center. S.H. and C.L. were supported by an Institute for Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (Grant No. RS-2023-00222863) and S.H. was also supported by the National Research Foundation of Korea (NRF) (Grants No. RS-2023-00283146 and No. RS-2024-00352325). This manuscript has been authored, in part, by UT-Battelle LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy (DOE).