Multiphoton discrimination at telecom wavelength with charge integration photon detector

Fujiwara, Mikio; Sasaki, Masahide
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p111119
Academic Journal
We present a charge integration photon detector (CIPD) that enables the efficient measurement of photon number states at the telecom-fiber wavelengths with a quantum efficiency of 80% and a resolution less than 0.5 electrons at 1 Hz sampling. The CIPD consists of an InGaAs pin photodiode and a GaAs JFET in a charge integration amplifier, which is cooled to 4.2 K to reduce thermal noise and leakage current. The charge integration amplifier exhibits a low noise level of 470 nV/Hz1/2. The dark count is as low as 500 electrons/h.


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