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Proceedings Paper

SPAD electronics for high-speed quantum communications
Author(s): Joshua C. Bienfang; Alessandro Restelli; Alan Migdall
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Paper Abstract

We discuss high-speed electronics that support the use of single-photon avalanche diodes (SPADs) in gigahertz singlephoton communications systems. For InGaAs/InP SPADs, recent work has demonstrated reduced afterpulsing and count rates approaching 500 MHz can be achieved with gigahertz periodic-gating techniques designed to minimize the total avalanche charge to less than 100 fC. We investigate afterpulsing in this regime and establish a connection to observations using more conventional techniques. For Si SPADs, we report the benefits of improved timing electronics that enhance the temporal resolution of Si SPADs used in a free-space quantum key distribution (QKD) system operating in the GHz regime. We establish that the effects of count-rate fluctuations induced by daytime turbulent scintillation are significantly reduced, benefitting the performance of the QKD system.

Paper Details

Date Published: 24 January 2011
PDF: 5 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79452N (24 January 2011); doi: 10.1117/12.875564
Show Author Affiliations
Joshua C. Bienfang, National Institute of Standards and Technology (United States)
Alessandro Restelli, National Institute of Standards and Technology (United States)
Alan Migdall, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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