Quantum interferometry using coherent beam stimulated parametric down-conversion

TL;DR

This paper demonstrates how stimulated parametric down-conversion can enhance quantum interferometry by improving visibility and count rates beyond the diffraction limit, with controllable phase dependence.

Contribution

It introduces a method to use stimulated parametric processes to overcome low visibility and increase count rates in quantum interferometry experiments.

Findings

Enhanced count rates by several orders of magnitude.

Improved visibility beyond the diffraction limit.

Visibility and counts are phase-controlled by the stimulating beam.

Abstract

We show how stimulated parametric processes can be employed in experiments on beyond the diffraction limit to overcome the problem of low visibility obtained by using spontaneous down conversion operating in the high gain regime. We further show enhancement of the count rate by several orders when stimulated parametric processes are used. Both the two photon counts and the visibility can be controlled by the phase of the stimulating coherent beam.