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Mohsen K Akhlaghi1, A Hamed Majedi, Jeff S Lundeen

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Solid-state physics

Background:

  • Superconducting Nanowire Single Photon Detectors (SNSPDs) are crucial for quantum technologies.
  • Existing models lack validity for multi-photon scenarios.
  • SNSPDs show nonlinear responses to light, a feature with potential applications.

Purpose of the Study:

  • To develop an accepted quantum optical model for SNSPDs valid for multiple input photons.
  • To investigate and incorporate the nonlinear response of SNSPDs into a device-independent model.

Main Methods:

  • Detector Tomography was employed to gather experimental data.
  • An existing model was refined based on experimental results.
  • A new device-independent model was formulated.

Main Results:

  • An improved quantum optical model for SNSPDs was established.
  • The model accurately describes detector behavior with multiple photons.
  • The nonlinear response of SNSPDs was successfully characterized and modeled.

Conclusions:

  • The developed model enhances the understanding of SNSPD performance.
  • The device-independent model provides a versatile tool for quantum applications.
  • Incorporating nonlinearity opens new avenues for SNSPD utilization in quantum information processing.