Single photon detectors are the key components in numerous photonics-related applications such as quantum cryptography, optical time-domain reflectometry, and integrated circuit testing as well as serving diverse applications in metrology, both classical and, more recently, quantum. We are working on several different systems including avalanche photodiodes (APD) superconducting nanowire detectors (SNSPD) and hybrid devices for various wavelength demands as well as photon number resolving capabilities. GAP initially worked on telecommunication metrology though our focus is more oriented towards quantum aspects we continue to take advantage of combining both. A particularly successful area has been in combining single photon detectors and optical time domain reflectometry (OTDR). More recently we have also used the no-cloning theorem as the basis for a practical primary standard for radiated power.
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For more details on some of our current activities see