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Modified detector tomography technique applied to a superconducting multiphoton nanodetector.

J J Renema1, G Frucci, Z Zhou

  • 1Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands. renema@physics.leidenuniv.nl

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Area of Science:

  • Quantum Optics
  • Solid-State Physics
  • Nanotechnology

Background:

  • Characterizing multi-photon detectors is essential for advancing quantum information protocols.
  • Existing methods often struggle with detectors exhibiting low overall detection efficiency.
  • Understanding detector physics requires disentangling nonlinear detection events from linear optical losses.

Purpose of the Study:

  • To present a novel experimental method for characterizing multi-photon detectors with low detection efficiency.
  • To separate the nonlinear detection process from linear optical losses.
  • To provide a comprehensive understanding of the underlying physics of superconducting nano-detectors.

Main Methods:

  • Developed an experimental technique to isolate the nonlinear multiphoton detection event.
  • Implemented a method to distinguish detector efficiency from system-wide linear losses.
  • Applied the characterization to a superconducting niobium nitride (NbN) nanowire nanodetector with a bowtie constriction.

Main Results:

  • Successfully characterized a superconducting multiphoton nanodetector.
  • Demonstrated the detector's operation in both single- and multi-photon sensitive regimes.
  • Provided the first full experimental characterization of this specific type of nanodetector.

Conclusions:

  • The presented method enables accurate characterization of low-efficiency multi-photon detectors.
  • This technique is vital for the development and application of quantum information technologies.
  • The study offers quantitative insights into the physics of superconducting nanodetectors.