Quantum information processing based on light has invigorated research on the production and detection of single photons. The authors present an innovative detection scheme for weak microwave signals, based on a superconducting current-biased Josephson junction. In contrast to detectors that absorb photons, this system is optimized such that the amplitude of the classical photon field triggers detection.
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Oelsner et al. (2017) studied this question.
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