We present the experimental demonstration of a superconducting photon number resolving. It is based on the series connection of N superconducting nanowires, each connected in to an integrated resistor. The device provides a single voltage readout, proportional to the of photons detected in distinct nanowires. Clearly separated output levels corresponding to detection of n¼14 photons are observed in a 4-element detector fabricated from an NbN film GaAs substrate, with a single-photon system quantum efficiency of 2.6% at k¼1.3 lm. The-nanowire structure is promising in view of its scalability to large photon numbers and high.
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Jahanmirinejad et al. (2012) studied this question.
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