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Proceedings Paper

Volume Bragg gratings for wavelength division multiplexing of entanglement-based quantum key distribution in free space
Author(s): Riza Fazili; Fabian Steinlechner
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Paper 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.

Paper Details

Date Published: 28 February 2020
PDF: 6 pages
Proc. SPIE 11295, Advanced Optical Techniques for Quantum Information, Sensing, and Metrology, 112950C (28 February 2020); doi: 10.1117/12.2545671
Show Author Affiliations
Riza Fazili, Fraunhofer Institute for Applied Optics and Precision Engineering IOF (Germany)
Friedrich Schiller Univ. of Jena (Germany)
Fabian Steinlechner, Fraunhofer Institute for Applied Optics and Precision Engineering IOF (Germany)
Friedrich Schiller Univ. of Jena (Germany)


Published in SPIE Proceedings Vol. 11295:
Advanced Optical Techniques for Quantum Information, Sensing, and Metrology
Philip R. Hemmer; Alan L. Migdall; Zameer Ul Hasan, Editor(s)

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