Single photon counting at telecom wavelength and quantum key distribution

Authors: Alexei Trifonov1; Darius Subacius1; Audrius Berzanskis1; Anton Zavriyev1

Source: Journal of Modern Optics, Volume 51, Numbers 9-10, 15 June-10 July 2004 , pp. 1399-1415(17)

Publisher: Taylor and Francis Ltd

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Abstract:

A brief overview is given of single photon detector performance requirements for quantum cryptography applications. The analysis is made with respect to restrictions necessary to secure the quantum key distribution channel. InGaAs/InP avalanche photodiode performance is analysed for single photon counting at 1550 nm. Quantum efficiency, dark current and afterpulsing probability (for times up to 100 mus after an initial avalanche) are studied in a wider temperature range than previously reported (0°C to -80°C). We show that photon counting is a bottle-neck in current quantum key distribution systems and provides the source for future performance improvement.

Document Type: Research article

DOI: 10.1080/09500340410001670811

Affiliations: 1: MagiQ Technologies, Inc. 11 Ward St. Somerville MA 02143 USA, Email: alexei@magiqtech.com

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