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An energy resolution of 0.6 eV was achieved with an NbN superconducting nanowire single-photon detector for near infrared photons in the energy range from 1.2 eV to 0.8 eV. The detector operates at 6 K and is read out with a room-temperature amplifier. The photon-energy dependent response of the detector is associated with the change of the detection scenario from the hot-spot formation to unbinding...
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