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arXiv · 2307.08619

Telecom networking with a diamond quantum memory

Eric Bersin·Madison Sutula·Yan Qi Huan·Aziza Suleymanzade·Daniel R. Assumpcao·Yan-Cheng Wei·Pieter-Jan Stas·Can M. Knaut·Erik N. Knall·Carsten Langrock·Neil Sinclair·Ryan Murphy·Ralf Riedinger·Matthew Yeh·C. J. Xin·Saumil Bandyopadhyay·Denis D. Sukachev·Bartholomeus Machielse·David S. Levonian·Mihir K. Bhaskar·Scott Hamilton·Hongkun Park·Marko Lončar·Martin M. Fejer·P. Benjamin Dixon·Dirk R. Englund·Mikhail D. Lukin
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Abstract

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 ($g^2(0)<0.1$) and high indistinguishability ($V=89\pm8\%$). 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 $\mathcal{F}=87\pm 2.5 \% $. These results demonstrate the viability of SiV quantum memories integrated with telecom-band systems for scalable quantum networking applications.

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Eric Bersin, Madison Sutula, Yan Qi Huan, Aziza Suleymanzade, Daniel R. Assumpcao, Yan-Cheng Wei, Pieter-Jan Stas, Can M. Knaut, Erik N. Knall, Carsten Langrock, Neil Sinclair, Ryan Murphy, Ralf Riedinger, Matthew Yeh, C. J. Xin, Saumil Bandyopadhyay, Denis D. Sukachev, Bartholomeus Machielse, David S. Levonian, Mihir K. Bhaskar, Scott Hamilton, Hongkun Park, Marko Lončar, Martin M. Fejer, P. Benjamin Dixon, Dirk R. Englund, Mikhail D. Lukin. 2023-07-17. Telecom networking with a diamond quantum memory. https://doi.org/10.1103/prxquantum.5.010303

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