Entanglement of Nanophotonic Quantum Memory Nodes in a Telecommunication Network

• DOI: 10.48550/arxiv.2310.01316
• Publication Date: 2023-01-01
• Authors: C. M. Knaut; Aziza Suleymanzade; Yan-Cheng Wei; Daniel Assumpção; Pieter-Jan Stas; Yan Qi Huan; Bartholomeus Mach...; Erik Knall; Madison Sutula; Gefen Baranes; Neil Sinclair; Chawina De-Eknamkul; David Levonian; Mihir K. Bhaskar; Hongkun Park; Marko Lončar; Mikhail D. Lukin
• Keywords: Quantum sensor; Quantum teleportation

A key challenge in realizing practical quantum networks for long-distance communication involves robust entanglement between memory nodes connected via fiber optical infrastructure. Here, we demonstrate a two-node network composed of multi-qubit registers based on silicon-vacancy (SiV) centers nanophotonic diamond cavities integrated with telecommunication (telecom) network. Remote is generated the cavity-enhanced interactions SiV's electron spin qubits and photons. Serial, heralded spin-photon entangling gate operations time-bin are used separated nodes. Long-lived nuclear to provide second-long storage error detection. By integrating efficient bi-directional frequency conversion photonic telecom frequencies (1350 nm), two memories through 40 km spools low-loss 35 long loop deployed Boston area urban environment, representing an enabling step towards repeaters large-scale networks.