Multiplexed nanowire detectors count photons to sub-photon uncertainty up to 276

A team at Paderborn University in Germany has built a detection system that counts photons across a range from zero to more than 9,000. Combining superconducting nanowire single-photon detectors (SNSPDs) with multiplexing, the researchers measured pulses of up to 276 photons with an uncertainty below one photon. The…