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

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

2005-12-09

arxiv.org/abs/quant-ph/0512070v1

Optics letters Vol. 31, 691 (2006)

Physics

Quantum Physics

12 pages, 3 figures. to appear in Optics Letters

Scientific paper

10.1364/OL.31.000691

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

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