Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 20, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/20/5/055301
Keywords
optical detectors; electrical noise; quantum noise
Funding
- Danish National Research Foundation
- EU
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We report on the performance of ultra low-noise differential photodetectors especially designed for probing of atomic ensembles with weak light pulses. The working principle of the detectors is described together with the analysis procedures employed to extract the photon shot noise of light pulses with similar to 1 mu s duration. As opposed to frequency response peaked detectors, our approach allows for broadband quantum noise measurements. The equivalent noise charge (ENC) for two different hardware approaches is evaluated to 280 and 340 electrons per pulse, respectively, which corresponds to a dark noise equivalent photon number of n(3dB) = 0.8 x 10(5) and n(3dB) = 1.2 x 10(5) in the two approaches. Finally, we discuss the possibility of removing classical correlations in the output signal caused by detector imperfection by using double-correlated sampling methods.
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