DOE OSTI · 2279123
Telecom Networking with a Diamond Quantum Memory
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 ( Si V ) center in diamond to the telecom O band, maintaining low noise ( g 2 ( 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 entangling them with a diamond quantum memory with fidelity F ≥ 87 ± 2.5 % . These results demonstrate the viability of Si V quantum memories integrated with telecom-band systems for scalable quantum networking applications. Published by the American Physical Society 2024
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Bersin, Eric (ORCID:0000000306435534), Sutula, Madison (ORCID:0000000196765611), Huan, Yan Qi (ORCID:0000000265057150), Suleymanzade, Aziza (ORCID:0000000290556154), Assumpcao, Daniel R. (ORCID:0000000203749901), Wei, Yan-Cheng (ORCID:0000000290769897), Stas, Pieter-Jan, Knaut, Can M., Knall, Erik N., Langrock, Carsten (ORCID:0000000229475312), Sinclair, Neil, Murphy, Ryan, Riedinger, Ralf (ORCID:0000000201872332), Yeh, Matthew (ORCID:0000000187116505), Xin, C. J. (ORCID:0000000295961407), Bandyopadhyay, Saumil (ORCID:000000027761337X), Sukachev, Denis D. (ORCID:0000000242732184), Machielse, Bartholomeus (ORCID:0000000329407843), Levonian, David S. (ORCID:000000025443992X), Bhaskar, Mihir K. (ORCID:0000000284754613), Hamilton, Scott, Park, Hongkun (ORCID:0000000195768829), Lončar, Marko (ORCID:0000000250295017), Fejer, Martin M. (ORCID:0000000255121905), Dixon, P. Benjamin (ORCID:0000000345462682), Englund, Dirk R., Lukin, Mikhail D. (ORCID:0000000286581007). 2024-01-08. Telecom Networking with a Diamond Quantum Memory. https://doi.org/10.1103/prxquantum.5.010303
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