Uncovering Quantum Correlations with Time-Multiplexed Click Detection

Abstract

We report on the implementation of a time-multiplexed click detection scheme to probe quantum correlations between different spatial optical modes. We demonstrate that such measurement setups can uncover nonclassical correlations in multimode light fields even if the single mode reductions are purely classical. The nonclassical character of correlated photon pairs, generated by a parametric down-conversion, is immediately measurable employing the theory of click counting instead of low-intensity approximations with photoelectric detection models. The analysis is based on second- and higher-order moments, which are directly retrieved from the measured click statistics, for relatively high mean photon numbers. No data postprocessing is required to demonstrate the effects of interest with high significance, despite low efficiencies and experimental imperfections. Our approach shows that such novel detection schemes are a reliable and robust way to characterize quantum-correlated light fields for practical applications in quantum communications.

6 pages, incl. supplemental material

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Cited by in corpus (5)

• Direct calibration of click-counting detectors
• Experimental detection of nonclassicality of single-mode fields via intensity moments
• Experimental identification of non-classicality of noisy twin beams and other related two-mode states
• Wave-particle duality revisited: Neither wave nor particle
• Beyond conventional photon-number detection with click detectors