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Fiber-coupled single-photon detectors based on NbN superconducting nanostructures for practical quantum cryptography and photon-correlation studies

2006; American Institute of Physics; Volume: 88; Issue: 26 Linguagem: Inglês

10.1063/1.2218105

1520-8842

W. Słysz, M. Węgrzecki, Jan Bar, P. Grabiec, M. Górska, Val Zwiller, Christian Latta, Pascal Böhi, I. Milostnaya, Olga Minaeva, A.V. Antipov, O. Okunev, A. Korneev, К. В. Смирнов, B. Voronov, N. Kaurova, Gregory Goltsman, Aaron Pearlman, A. Cross, I. Komissarov, A. Verevkin, Roman Sobolewski,

Advanced Fiber Laser Technologies

We have fabricated and tested a two-channel single-photon detector system based on two fiber-coupled superconducting single-photon detectors (SSPDs). Our best device reached the system quantum efficiency of 0.3% in the 1540-nm telecommunication wavelength with a fiber-to-detector coupling factor of about 30%. The photoresponse consisted of 2.5-ns-wide voltage pulses with a rise time of 250ps and timing jitter below 40ps. The overall system response time, measured as a second-order, photon cross-correlation function, was below 400ps. Our SSPDs operate at 4.2K inside a liquid-helium Dewar, but their optical fiber inputs and electrical outputs are at room temperature. Our two-channel detector system should find applications in practical quantum cryptography and in antibunching-type quantum correlation measurements.