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This research presents a novel protocol for distributed quantum sensing networks that achieves Heisenberg scaling while managing the trade-off between global estimation accuracy and individual data privacy. By utilizing shared entangled Gaussian states with localized encoding, the study demonstrates how multi-party systems can shield local phase information, though complete privacy remains theoretically limited in finite-squeezing regimes without emerging only in large-squeezing limits.
Protocol balances accuracy and privacy in quantum sensing networks
This research introduces a new method for distributed quantum sensing, balancing high accuracy with individual data privacy.
Researchers at the Technical University of Denmark and Sorbonne Université have introduced and analysed a protocol for distributed quantum sensing that estimates an average phase with precision increasing alongside the total photon number, exhibiting Heisenberg scaling. The work answers the question of whether a network can estimate a global parameter while protecting locally encoded values, with each node encoding a local phase into a shared entangled Gaussian state. Complete privacy is unattainable for finite squeezing in multi-party settings, but it emerges in the large-squeezing limit. The team further investigated the impact of displacements and optical losses, revealing trade-offs between estimation accuracy…
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