Distributed quantum sensing with continous-variable entanglement: from fundamentals to dark matter search

Quantum information science has enabled advanced capabilities in quantum sensing, communication and computation. Entanglement is the unique resource behind many of the applications. In this talk, I will introduce recent advances in distributed quantum sensing with continuous-variable entanglement, where the estimation precision of a global property of multiple local parameters is improved. I will begin with the early works on optical displacement sensing, and the proof-of-principle experiments. Then, I will consider dark matter search as an example to illustrate the working mechanism of distributed quantum sensing. Fundamental limits of dark matter search will be presented, as well as how multipartite entanglement between microwave cavities or optomechanical systems boost the scan rates. Finally, I will talk about protocol designs for quantum networking and transduction to share entanglement across multiple sensors. Teleportation-based and squeezing-enhanced transduction protocols between optical and microwave will be introduced. I will also briefly talk about continuous-variable quantum error correction for improving the quality of entanglement.