Photon detector measures pulses of up to 276 photons with sub-photon uncertainty
Image: Primary Researchers at Paderborn University demonstrated measurements of laser pulses containing up to 276 photons with uncertainty below one photon, in work described in Optica. Their system combines superconducting detectors with a method that divides incoming light into smaller pulses.
It splits each pulse into 128 pulses separated in time, then distributes them across eight detectors to create 1,024 detection bins. A model characterizes each bin's response. A conventional multiplexed system would need about 37,000 detector elements for the same precision.
The study tested laser pulses; applying the system to bright quantum states of light is planned.
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