Abstract
Abstract The calculation of autocorrelation functions represents a routinely used tool to characterise quantum states of light. In this paper, we evaluate the g(2) function for detected photons in the case of mesoscopic multi-mode twin-beam states in order to fully investigate their statistical properties starting from measurable quantities. Moreover, we show that the second-order autocorrelation function is also useful to estimate the spurious effects affecting the employed Silicon-photomultiplier detectors.
Highlights
Characterisation of Silicon photomultipliersAs already stated in the Introduction, our measurements have been performed in the mesoscopic intensity regime
Introduction subPoissonian states analogous to antibunching [6]
In the Introduction we claimed that the evaluation of the autocorrelation function expressed in terms of measurable quantities can help in the determination of the detector features, such as the mean value of dark counts, m dc, and the cross-talk probability, ε
Summary
As already stated in the Introduction, our measurements have been performed in the mesoscopic intensity regime. In the Introduction we claimed that the evaluation of the autocorrelation function expressed in terms of measurable quantities can help in the determination of the detector features, such as the mean value of dark counts, m dc, and the cross-talk probability, ε. In the case of multi-mode thermal light with μ modes populated g( )(n) = To experimentally prove these statements, we generated a multi-mode twin-beam (TWB) state by means of parametric downconversion (see Fig. 1). We used two commercial SiPMs (MPPC S13360-1350CS) produced by Hamamatsu [23] Such detectors are endowed with a moderate rate of dark count at room temperature (∼ 140 kHz) and a low cross-talk probability (∼ %). The two detector outputs were ampli ed and integrated by means of sync
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