2 research outputs found
Continuous variable entanglement between propagating optical modes using optomechanics
This article proposes a new method to entangle two spatially separated output
laser fields from an optomechanical cavity with a membrane in the middle. The
radiation pressure force coupling is used to modify the correlations between
the input and the output field quadratures. Then the laser fields at the
optomechanical cavity output are entangled using the quantum back-action
nullifying meter technique. The effect of thermal noise on the entanglement is
studied. For experimentally feasible parameters, the entanglement between the
laser fields survives upto room temperature.Comment: 14 pages, 4 figures, 68 reference
Optical ranging with quantum advantage
The quantum illumination technique requires joint measurement between the
idler and the probe reflected from the low-reflective target present in a noisy
environment. The joint measurement is only possible with prior knowledge about
the target's location. The technique in this article overcomes this limitation
by using entanglement and a cross-correlated homodyne measurement. This
technique does not require quantum storage of the idler and prior knowledge
about the target's distance. The cross-correlation measurement makes this
technique completely immune to environmental noise, as the correlation between
the idler and the environment is zero. The low reflectivity of the target is
negated by increasing the intensity of the reference fields (non-entangled) in
the homodyne. Based on heuristic arguments, a lower bound of the target's
reflectivity for optimum application of this technique is described.Comment: 10 pages, 1 figure, 49 reference