Photon number resolving detection at telecom wavelength with a charge integration photon detector

摘要

We demonstrate multiphoton discrimination at telecom wavelength with thereadout frequency of 40 Hz by charge integration photon detector (CIPD). TheCIPD consists of an InGaAs pin photodiode and a GaAs junction field effecttransistor as a pre-amplifier in a charge integration circuit, which is cooledto 4.2 K to reduce thermal noise. The quantum efficiency of the CIPD (detectoritself) is 80% for 1530 nm light, and the readout noise is measured as 0.26electrons at 40 Hz. We can construct Poisson distributions of photo-carrierswith distinguished peaks at each photo-carrier number corresponding to thesignal to noise ratio of about 3.