Complete experimental characterization of a superconducting multiphoton nanodetector

Details Complete experimental characterization of a superconducting multiphoton nanodetector Complete experimental characterization of a superconducting multiphoton nanodetector

2011-10-25

arxiv.org/abs/1110.5442v1

Physics

Quantum Physics

Scientific paper

We present a complete method to characterize multiphoton detectors with a small overall detection e?ciency. We do this by separating the nonlinear action of the multiphoton detection event from linear losses in the detector. Such a characterization is a necessary step for quantum information protocols with single and multiphoton detectors and can provide quantitative information to understand the underlying physics of a given detector. This characterization is applied to a superconducting multiphoton nanodetector, consisting of an NbN nanowire with a bowtie-shaped subwavelength constriction. Depending on the bias current, this detector has regimes with single and multiphoton sensitivity. We present the ?rst full experimental characterization of such a detector.

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