24 January 2011 SPAD electronics for high-speed quantum communications
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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.
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Joshua C. Bienfang, Joshua C. Bienfang, Alessandro Restelli, Alessandro Restelli, Alan Migdall, Alan Migdall, } "SPAD electronics for high-speed quantum communications", Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79452N (24 January 2011); doi: 10.1117/12.875564; https://doi.org/10.1117/12.875564

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