Advanced optical quantum information processing applications place stringent demands on the performance of key components such as single-photon detectors . A new class of single-photon detectors based on superconducting nanowires has recently emerged, offering telecom-wavelength sensitivity, combined with low dark counts, short recovery times and low timing jitter. I will describe the basic operating principle of this type of device, the current state-of-the-art and prospects for improvements. I will also discuss implementations of these devices in quantum information processing applications such as quantum key distribution , characterization of quantum emitters and operation of quantum waveguide circuits .
 Hadfield R. H. Nature Photonics 3 696 (2009)
 Takesue H. et al Nature Photonics 1 343 (2007) Natarajan C. M. et al Applied Physics Letters 96 211101 (2010)