Spin-Photon Entanglement of a Single Er 3 + Ion in the Telecom Band

Uysal, Mehmet T.; Dusanowski, Łukasz; Xu, Haitong; Horvath, Sebastian P.; Ourari, Salim; Cava, Robert J.; de Leon, Nathalie P.; Thompson, Jeff D.

doi:10.1103/PhysRevX.15.011071

Spin-Photon Entanglement of a Single ${Er}^{3 +}$ Ion in the Telecom Band

Journal Article · Wed Mar 26 00:00:00 EDT 2025 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.15.011071· OSTI ID:2539957

; Dusanowski, Łukasz; ; Horvath, Sebastian P.; Ourari, Salim; Cava, Robert J.; ;

Entanglement between photons and a quantum memory is a key component of quantum repeaters, which allow long-distance quantum entanglement distribution in the presence of fiber losses. Spin-photon entanglement has been implemented with a number of different atomic and solid-state qubits with long spin coherence times, but none directly emit photons into the $1.5 − μ m$ telecom band where losses in optical fibers are minimized. Here, we demonstrate spin-photon entanglement using a single rare earth ion in the solid-state ${Er}^{3 +}$ coupled to a silicon nanophotonic cavity, which directly emits photons at 1532.6 nm. We infer an entanglement fidelity of 73(3)% after propagating through 15.6 km of optical fiber. This work opens the door to large-scale quantum networks based ${Er}^{3 +}$ ions, leveraging scalable silicon device fabrication and spectral multiplexing.

Published by the American Physical Society 2025

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Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704; SC0020120

OSTI ID:: 2539957

Alternate ID(s):: OSTI ID: 2565263

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 1 Vol. 15; ISSN PRXHAE; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Spin-Photon Entanglement of a Single ${Er}^{3 +}$ Ion in the Telecom Band