A superconducting single photon detector (SSPD) is promising candidate of the detector in a quantum key distribution (QKD) system, because of its low dark count and high speed repetition rate. We have developed the SSPD system cooled by a GM cryocooler. In this system, and the work surface can be cooled 2.95 K and up to 6 SSPDs can be installed. The active areas of SSPDs are or and the system detection efficiency at dark count rate of 100 Hz reached 2.6% at a wavelength of 1550 nm.
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© 2009 American Institute of Physics.
2009
American Institute of Physics
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