  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 even in the presence of
significant losses, rendering the new nonclassicality test more practical and
flexible to be used in various nanophotonic platforms.

Quantum Physics