Scientific article

Local and scalable detection of genuine multipartite single-photon path entanglement

Published inQuantum, vol. 6, 671
Publication date2022-03-22
First online date2022-03-22

How can a multipartite single-photon path-entangled state be certified efficiently by means of local measurements? We address this question by constructing an entanglement witness based on local photon detections preceded by displacement operations to reveal genuine multipartite entanglement. Our witness is defined as a sum of three observables that can be measured locally and assessed with two measurement settings for any number of parties N. For any bipartition, the maximum mean value of the witness observable over biseparable states is bounded by the maximum eigenvalue of an N x N matrix, which can be computed efficiently. We demonstrate the applicability of our scheme by experimentally testing the witness for heralded 4- and 8-partite single-photon path-entangled states. Our implementation shows the scalability of our witness and opens the door for distributing photonic multipartite entanglement in quantum networks at high rates.

Citation (ISO format)
CASPAR, Patrik et al. Local and scalable detection of genuine multipartite single-photon path entanglement. In: Quantum, 2022, vol. 6, p. 671. doi: 10.22331/q-2022-03-22-671
Main files (1)
Article (Submitted version)
ISSN of the journal2521-327X

Technical informations

Creation03/23/2022 8:51:00 AM
First validation03/23/2022 8:51:00 AM
Update time04/24/2023 12:33:15 PM
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