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