Practical quantum networks require interfacing quantum memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional quantum frequency conversion that enables a solid-state quantum memory to directly interface with telecom-band systems. In particular, we demonstrate conversion of visible-band single photons emitted from a silicon-vacancy (SiV) center in diamond to the telecom O-band, maintaining low noise (g2(0)<0.1) and high indistinguishability (V=89±8%). We further demonstrate the utility of this system for quantum networking by converting telecom-band time-bin pulses, sent across a lossy and noisy 50 km deployed fiber link, to the visible band and mapping their quantum states onto a diamond quantum memory with fidelity F=87±2.5%. These results demonstrate the viability of SiV quantum memories integrated with telecom-band systems for scalable quantum networking applications.
Cite
@article{arxiv.2307.08619,
title = {Telecom networking with a diamond quantum memory},
author = {Eric Bersin and Madison Sutula and Yan Qi Huan and Aziza Suleymanzade and Daniel R. Assumpcao and Yan-Cheng Wei and Pieter-Jan Stas and Can M. Knaut and Erik N. Knall and Carsten Langrock and Neil Sinclair and Ryan Murphy and Ralf Riedinger and Matthew Yeh and C. J. Xin and Saumil Bandyopadhyay and Denis D. Sukachev and Bartholomeus Machielse and David S. Levonian and Mihir K. Bhaskar and Scott Hamilton and Hongkun Park and Marko Lončar and Martin M. Fejer and P. Benjamin Dixon and Dirk R. Englund and Mikhail D. Lukin},
journal= {arXiv preprint arXiv:2307.08619},
year = {2024}
}