Abstract
The efficient certification of nonclassical effects of light forms the basis for applications in optical quantum technologies. We derive general correlation conditions for the verification of nonclassical light based on multiplexed detection. The obtained nonclassicality criteria are valid for imperfectly-balanced multiplexing scenarios with on-off detectors and do not require any knowledge about the detector system. In this sense they are fully independent of the detector system. In our experiment, we study light emitted by clusters of single-photon emitters, whose photon number may exceed the number of detection channels. Even under such conditions, our criteria certify nonclassicality with high statistical significance.
Highlights
The verification of quantum correlations in optical systems is a key task in quantum optics
Such strategies do not provide a direct access to the photon-number distribution and the interpretation of the measurement statistics as the photon-number statistics can lead to a false certification of nonclassicality [19]
We apply the nonclassicality criteria based on the inequalities (4) and (5) to the multiplexing data obtained for the different cluster sizes
Summary
The verification of quantum correlations in optical systems is a key task in quantum optics. For the analysis of quantum light in this regime, so-called multiplexing strategies [9,10,11,12,13,14,15,16,17,18] have been developed as a way of gaining insights in the measured quantum state even when a photon-number-resolving measurement is not accessible Such strategies do not provide a direct access to the photon-number distribution and the interpretation of the measurement statistics as the photon-number statistics can lead to a false certification of nonclassicality [19]. Other multiplexing strategies such as fiber-loop detectors [11,33] by design do not provide an equal splitting For such unequal-splitting scenarios, a condition based on second-order moments [25] has been derived as a generalization of the corresponding equal-splitting condition [20]. The relations of the presented nonclassicality certifiers to other nonclassicality criteria based on the Mandel Q parameter and the matrix of moments approach are discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
