Quantum Rangefinding
Stefan Frick, Alex McMillan, John Rarity
TL;DR
This paper explores how the thermal characteristics of bipartite photon states in quantum light can be harnessed for rangefinding, enabling object detection and camouflaging simultaneously, which was previously overlooked.
Contribution
It demonstrates that a maximally mixed state can be used for quantum rangefinding and camouflage, revealing a novel application of thermal properties in quantum optics.
Findings
Maximally mixed states can be used for object position estimation.
Thermal characteristics can provide camouflage against background light.
Quantum rangefinding benefits from thermal state properties.
Abstract
Quantum light generated in non-degenerate squeezers has many applications such as sub-shot-noise transmission measurements to maximise the information extracted by one photon or quantum illumination to increase the probability in target detection. However, any application thus far fails to consider the thermal characteristics of one half of the bipartite down-converted photon state often used in these experiments. We show here that a maximally mixed state, normally viewed as nuisance, can indeed be used to extract information about the position of an object while at the same time providing efficient camouflaging against other thermal or background light.
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