Year: 2016
Type: article
Abstract: We study, in theory and experiment, the quantum properties of correlated light fields measured with click-counting detectors providing incomplete information on the photon statistics. We establish a correlation parameter for the conditional statistics, and we derive the corresponding nonclassicality criteria for detecting conditional quantum correlations. Classical bounds for Pearson's correlation parameter are formulated that allow us, once they are violated, to determine nonclassical correlations via the joint statistics. On the one hand, we demonstrate nonclassical correlations in terms of the joint click statistics of light produced by a parametric down-conversion source. On the other hand, we verify quantum correlations of a heralded, split single-photon state via the conditional click statistics together with a generalization to higher-order moments. We discuss the performance of the presented nonclassicality criteria to successfully discern joint and conditional quantum correlations. Remarkably, our results are obtained without making any assumptions on the response function, quantum efficiency, and dark-count rate of photodetectors.
Source: Physical Review Letters
Institutions: University of Oxford, University of Rostock, Paderborn University, Roma Tre University, Shanghai Jiao Tong University, State Key Laboratory of Advanced Optical Communication Systems and Networks, State Key Laboratory of Advanced Optical Communication Systems and Networks, University of Warwick
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: bronze
Awards: UK Quantum Technology Hub in Quantum Enhanced Imaging, Quantum-enabled Enhancements in presence of Noise (QueEN), G2364852334, UK Quantum Technology Hub: NQIT - Networked Quantum Information Technologies, G3283837732, Quantum-enabled Enhancements in presence of Noise (QueEN), G3772063132, G434337789, G4475990857, Quantum Controlled Ultrafast Multimode Entanglement and Measurement, G6765302189, G6934482175, Building Large Quantum States out of Light, G8703912931, G8960705998
OpenAlex ID: W2288955886