CQC2T Seminar (UNSW Sydney): Detecting single infrared photons with 95% system efficiency

28 March, 2019 @ 3:00 pm - 4:00 pm

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Speaker – Ian Berkman, UNSW Sydney:

The past decade has seen an astonishing increase in interest in single photon detector technologies with high detection efficiency and fast reset times. Besides single-photon detectors being one of the key elements in quantum optics experiments, a major driver of the current research into achieving a high efficiency performance is the explosive growth of the field of quantum-information science[1,2]. Furthermore, fast reset times enables future quantum optics experiments that require the detection of rapid subsequent photons.
We report on a fibre-coupled single-photon detection system that uses superconducting nanowire single-photon detectors[3,4] with a system detection efficiency (including optical coupling losses) of 95% for 1550 nm including a 33 ns reset time. This exceptional performance allows us in the future to integrate the single-photon detectors in nano-electronic devices to detect single photons emitted from ions in silicon.

[1] Tech. Rep., Quantum Cryptography Technology Experts Panel, Advanced Research and Development Activity (ARDA) (2004)
[2] A. Ekert, N. Gisin, B. Huttner, H. Inamori and H. Weinfurther, in The Physics of Quantum Information (Springer, Berlin, 2000)
[3] G. N. Gol’tsman et al. Appl. Phys. Lett. 79, 705-707 (2001)
[4] F. Marsili et al. Nature 7, 3 (2013)


28 March, 2019
3:00 pm - 4:00 pm
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Old Main Building, UNSW
Room G59, Old Main Building, UNSW Kensington Campus NSW Australia


02 93850147
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