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Article Dans Une Revue Quantum Année : 2022

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

Patrik Caspar
  • Fonction : Auteur
Enky Oudot
  • Fonction : Auteur
Pavel Sekatski
  • Fonction : Auteur
Nicolas Maring
  • Fonction : Auteur
Anthony Martin
  • Fonction : Auteur
Hugo Zbinden
  • Fonction : Auteur
Rob Thew
  • Fonction : Auteur

Résumé

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 $N\times N$ 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.

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Dates et versions

hal-03469468 , version 1 (07-12-2021)

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Citer

Patrik Caspar, Enky Oudot, Pavel Sekatski, Nicolas Maring, Anthony Martin, et al.. Local and scalable detection of genuine multipartite single-photon path entanglement. Quantum, 2022, 6, pp.671. ⟨10.22331/q-2022-03-22-671⟩. ⟨hal-03469468⟩
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