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Optics Communications

Using a switchable detector array to reduce the effect of single-photon detectors deadtime in a multibit/photon quantum link

Cong Liu, Yongxiong Ren, Jiapeng Zhao, Mohammad Mirhosseini, Seyed Mohammad Hashemi Rafsanjani, Guodong Xie, Kai Pang, Zhe Zhao, Long Li, Joshua C. Bienfang, Alan L. Migdall, Todd A. Brun, Moshe Tur, Robert W. Boyd, Alan E. Wilner

Published Feb 25, 2019• 0 citations
Publisher
DOI
10.1002/10.1016/j.optcom.2019.01.081

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We present a scheme for a photon-counting detection system that can be operated at incident photon rates higher than otherwise possible by suppressing the effects of detector deadtime. The method uses an array of N detectors and a 1-by-N optical switch with a control circuit to direct input light to live detectors. Our calculations and models highlight the advantages of the technique. In particular, using this scheme, a group of N detectors provides an improvement in operation rate that can exceed the improvement that would be obtained by a single detector with deadtime reduced by 1/N, even if it were feasible to produce a single detector with such a large improvement in deadtime. We model the system for continuous and pulsed light sources, both of which are important for quantum metrology and quantum key distribution applications.