Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths

A. Divochiy, F. Marsili, D.M.J. Bitauld, A. Gaggero, R. Leoni, F. Mattioli, A. Korneev, V. Seleznev, N. Kaurova, O. Minaeva, G.N. Gol'tsman, K.G. Lagoudakis, M. Benkhaoul, F.A. Lévy, A. Fiore

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Optical-to-electrical conversion, which is the basis of theoperation of optical detectors, can be linear or nonlinear.When high sensitivities are needed, single-photon detectorsare used, which operate in a strongly nonlinear mode, theirresponse being independent of the number of detectedphotons. However, photon-number-resolving detectors areneeded, particularly in quantum optics, where n-photon statesare routinely produced. In quantum communication andquantum information processing, the photon-numberresolvingfunctionality is key to many protocols, such as theimplementation of quantum repeaters1 and linear-opticsquantum computing2. A linear detector with single-photonsensitivity can also be used for measuring a temporalwaveform at extremely low light levels, such as in longdistanceoptical communications, fluorescence spectroscopyand optical time-domain reflectometry. We demonstrate here aphoton-number-resolving detector based on parallelsuperconducting nanowires and capable of counting up to fourphotons at telecommunication wavelengths, with an ultralowdark count rate and high counting frequency.
Originele taal-2Engels
Pagina's (van-tot)302-306
TijdschriftNature Photonics
Nummer van het tijdschrift5
StatusGepubliceerd - 2008

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