Sub-Poisson-Binomial Light
Changhyoup Lee, Simone Ferrari, Wolfram H. P. Pernice, Carsten, Rockstuhl

TL;DR
This paper introduces a new nonclassicality measure for light, Q_PB, based on click statistics from multiplexed detectors, which is more versatile and practical for integrated quantum nanophotonics.
Contribution
The paper presents Q_PB, a generalized nonclassicality parameter that replaces Q_B, applicable to arbitrary multiplexing schemes and robust against losses in nanophotonic setups.
Findings
Q_PB<0 indicates nonclassical light.
The method is effective with minimal experimental resources.
Nonclassical features are detectable despite significant losses.
Abstract
We introduce the general parameter Q_PB that provides an experimentally accessible nonclassicality measure for light. The parameter is quantified by the click statistics obtained from on-off detectors in a general multiplexing detection setup. Sub-Poisson-binomial statistics, observed by Q_PB<0, indicates that a given state of light is nonclassical. Our new parameter replaces the binomial parameter Q_B for more general cases, where any unbalance among the multiplexed modes is allowed, thus enabling the use of arbitrary multiplexing schemes. The significance of the parameter Q_PB is theoretically examined in a measurement setup that only consists of a ring resonator and a single on-off detector. The proposed setup exploits minimal experimental resources and is geared towards a fully integrated quantum nanophotonic circuit. The results show that nonclassical features remain noticeable…
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