Telecom networking with a diamond quantum memory

• DOI: 10.48550/arxiv.2307.08619
• Publication Date: 2023-01-01
• Authors: Eric Bersin; Madison Sutula; Yan Qi Huan; Aziza Suleymanzade; Daniel R. Assumpcao; Yan-Cheng Wei; Pieter-Jan Stas; C. M. Knaut; Erik Knall; Carsten Langrock; Neil Sinclair; Ryan P. Murphy; Ralf Riedinger; Matthew Yeh; C. J. Xin; Saumil Bandyopadhyay; Denis D. Sukachev; Bartholomeus Mach...; David Levonian; Mihir K. Bhaskar; Scott A. Hamilton; Hongkun Park; Marko Lončar; M. M. Fejer; P. Ben Dixon; Dirk Englund; Mikhail D. Lukin
• Keywords: Quantum sensor

Practical quantum networks require interfacing memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional frequency conversion enables a solid-state memory to directly interface telecom-band systems. In particular, of visible-band single photons emitted from silicon-vacancy (SiV) center diamond O-band, maintaining low noise ($g^2(0)<0.1$) high indistinguishability ($V=89\pm8\%$). We further utility this system for networking by converting time-bin pulses, sent across lossy noisy 50 km deployed fiber link, visible band mapping their states onto fidelity $\mathcal{F}=87\pm 2.5 \% $. These results viability SiV integrated scalable applications.