Condensed Matter Physics Seminar

Prof. Robert H. Hadfield, University of Glasgow

Wednesday 03 June 2015, 1500-1600
C1 Physics Building

Infrared single-photon detection with superconducting nanowires

Single photon detectors based on superconducting nanowires have emerged as a highly promising alternative for infrared single photon detection. These devices offer single photon sensitivity from visible to mid infrared wavelengths with high efficiency, low dark count rates and tens of picosecond timing precision1. I will discuss the basic device design, materials considerations, fabrication through electron beam lithography and integration with advanced optical structures2. I will also discuss prospects for scale-up from microscopic single pixel devices to large area arrays. I will describe how these low temperature devices can be mounted in practical closed-cycle systems for deployment in applications. I will then give an overview of applications where these devices are being deployed1,2, including long distance quantum cryptography, remote sensing, laser medicine and development of optical quantum computing.

References:

[1] RH Hadfield Single-photon detectors for quantum information applications Nature Photonics 3 (12) 696 (2009)

[2] CM Natarajan, MG Tanner, RH Hadfield Superconducting nanowire single-photon detectors: physics and applications Superconductor Science and Technology 25 063001 (2012)