2 Cryogenic Single Photon Detection System (12 Channel)

The Fraunhofer Institute of applied optics and precision engineering is actively researching quantum communication at high bit rates. For this purpose, we are developing novel sources of entangled photons capable of producing unprecedented photon pair rates. In order to detect these photon streams in a time-resolved manner it is necessary to acquire a multichannel single-photon detection system, which is capable of detecting high photon rates. To ensure that the photon stream does not saturate the detectors, it is required that these have a low dead time (Dead time: < 30 ns). Moreover, to maintain a high signal to noise ratio in quantum communication applications, it is required that each photo be identified with highest possible timing resolution, while at the same time achieving a detection efficiency of > 80 % at telecom wavelength. Cryogenic nanowire detectors are currently the only detection technology capable of simultaneously meeting these requirements. It is therefore planned to acquire a complete system for cryogenic, time-resolved single-photon detection.