Distributed quantum sensing in a continuous variable entangled network

Xueshi Guo*, Casper R. Breum, Johannes Borregaard, Shuro Izumi, Mikkel Vilsbøll Larsen, Tobias Gehring, Matthias Christandl, Jonas S. Neergaard-Nielsen*, Ulrik L. Andersen*

*Corresponding author for this work

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Abstract

Networking is integral to quantum communications1 and has significant potential for upscaling quantum computer technologies2. Recently, it was realized that the sensing performances of multiple spatially distributed parameters may also be enhanced through the use of an entangled quantum network3,4,5,6,7,8,9,10. Here, we experimentally demonstrate how sensing of an averaged phase shift among four distributed nodes benefits from an entangled quantum network. Using a four-mode entangled continuous-variable state, we demonstrate deterministic quantum phase sensing with a precision beyond what is attainable with separable probes. The techniques behind this result can have direct applications in a number of areas ranging from molecular tracking to quantum networks of atomic clocks.
Original languageEnglish
JournalNature Physics
Number of pages8
ISSN1745-2473
Publication statusAccepted/In press - 2020

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