  The advantages of using quantum states of light for object detection are
often highlighted in schemes that use simultaneous and optimal measurements.
Here, we describe a theoretical but experimentally realizable quantum
illumination scheme based on non-simultaneous and non-optimal measurements
which can maintain this advantage. In particular, we examine the multi-click
heralded two mode squeezed vacuum state as a probe signal in a quantum
illumination process. The increase in conditioned signal intensity associated
with multi-click heralding is greater than that from a single detector-heralded
signal. Our results show, for lossy external conditions, the presence of the
target object can be revealed earlier using multi-click measurements. We
demonstrate this through sequential shot measurements based on Monte-Carlo
simulation.

Quantum Physics