Multiphoton discrimination at telecom wavelength with charge integration photon detector

Details Multiphoton discrimination at telecom wavelength with charge integration photon detector Multiphoton discrimination at telecom wavelength with charge integration photon detector

2005-03-04

arxiv.org/abs/quant-ph/0503050v1

Physics

Quantum Physics

4 pages, 4 figures, accepted for Applied Physics letters

Scientific paper

10.1063/1.1886903

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/hour.

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