Volume Bragg gratings for wavelength division multiplexing of entanglement-based quantum key distribution in free space

Riza Fazili; Fabian Steinlechner

doi:10.1117/12.2545671

28 February 2020 Volume Bragg gratings for wavelength division multiplexing of entanglement-based quantum key distribution in free space

Riza Fazili, Fabian Steinlechner

Author Affiliations +

Proceedings Volume 11295, Advanced Optical Techniques for Quantum Information, Sensing, and Metrology; 112950C (2020) https://doi.org/10.1117/12.2545671
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Wavelength division multiplexing (WDM) improves key generation rates in quantum key distribution (QKD) and enables multi-user networks using shared quantum resources. The last years have seen a flurry of research on the implementation of WDM in fiber-based QKD where low-loss telecom components are widely available. However, WDM has not yet been demonstrated in free-space and satellite-based quantum communication in the wavelength range detectable by spacesuitable silicon single photon avalanche diodes. Here, we report a low-loss WDM at around 810 nm based on volume Bragg gratings. The total insertion loss for four wavelength channels matches state-of-the-art telecommunication WDM in the C-band. We characterize the performance in conjunction with a polarization-entangled photon source and report on preliminary assessments of background noise for a terrestrial free-space link in broad daylight.

Conference Presentation

Citation Download Citation

Riza Fazili and Fabian Steinlechner "Volume Bragg gratings for wavelength division multiplexing of entanglement-based quantum key distribution in free space", Proc. SPIE 11295, Advanced Optical Techniques for Quantum Information, Sensing, and Metrology, 112950C (28 February 2020); https://doi.org/10.1117/12.2545671

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