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Quantum 2.0 Conference and Exhibition

Bidirectional Two-Stage Quantum Frequency Conversion for SnV-resonant Photons to the Telecom C-Band

David Lindler, Tobias Bauer, Marlon Schäfer, Christoph Becher

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We present a bidirectional quantum frequency conversion scheme for photons resonant with SnV-centers in diamond to the telecom C-band, based on two-stage difference frequency generation in PPLN waveguides.
DOI
10.1364/quantum.2025.qth4c.1

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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