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Passive quantum interconnects: Multiplexed remote entanglement generation with cavity-assisted photon scattering

Seigo Kikura1,*, Kazufumi Tanji1, Akihisa Goban1,†, and Shinichi Sunami1,2,‡

  • *Contact author: seigo.kikura@nano-qt.com
  • †Contact author: akihisa.goban@nano-qt.com
  • ‡Contact author: shinichi.sunami@nano-qt.com
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Phys. Rev. Applied 26, 034021 – Published 10 September, 2026

DOI: https://doi.org/10.1103/32yf-3nsm

Abstract

We propose a time- and wavelength-multiplexed remote atom-atom entanglement generation protocol based on cavity-assisted photon scattering (CAPS). This is designed to achieve a high rate and high fidelity with robustness to operational imperfections, parameter fluctuations, and auxiliary time costs, such as percent-level photon impurity, timing and cavity parameter jitter, and atom shuttling time costs. We benchmark this protocol using comprehensive analytical and numerical modeling of the atom-cavity dynamics, including state-dependent pulse-delay effects, photon temporal impurity, atom-cavity system parameter fluctuations, and crosstalk among atoms through a shared cavity mode. With realistic atom-cavity system performance, we predict 2×105  s−1 successful atom-atom Bell pair generation even without in-cavity qubit reset, substantially enhanced from two-photon-interference-based protocols, at a predicted heralded fidelity of 0.999. We further show that the predicted rate scales further by the use of wavelength multiplexing while maintaining the fidelity.

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Phys. Rev. Applied 26, 034021– Published 10 September, 2026
  • Received 2 July 2025
  • Revised 18 June 2026
  • Accepted 10 August 2026
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