Resolving Photon Numbers Using a Superconducting Nanowire with Impedance-Matching Taper.

  title={Resolving Photon Numbers Using a Superconducting Nanowire with Impedance-Matching Taper.},
  author={Di Zhu and Marco Colangelo and Changchen Chen and Boris A. Korzh and Franco N. C. Wong and Matthew D. Shaw and Karl K. Berggren},
  journal={Nano letters},
Time- and number-resolved photon detection is crucial for quantum information processing. Existing photon-number-resolving (PNR) detectors usually suffer from limited timing and dark-count performance or require complex fabrication and operation. Here we demonstrate a PNR detector at telecommunication wavelengths based on a single superconducting nanowire with an integrated impedance-matching taper. The taper provides a kΩ load impedance to the nanowire, making the detector's output amplitude… 

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