Two-Level System as a Quantum Sensor for Absolute Calibration of Power

  title={Two-Level System as a Quantum Sensor for Absolute Calibration of Power},
  author={Teresa H{\"o}nigl-Decrinis and R. Sh. Shaikhaidarov and S. E. de Graaf and Victor N. Antonov and O. Astafiev},
  journal={Physical review applied},
A two-level quantum system can absorb or emit not more than one photon at a time. Using this fundamental property, we demonstrate how a superconducting quantum system strongly coupled to a transmission line can be used as a sensor of the photon flux. We propose four methods of sensing the photon flux and analyse them for the absolute calibration of power by measuring spectra of scattered radiation from the two-level system. This type of sensor can be tuned to operate in a wide frequency range… Expand
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