HIgh-Noon States with High Flux of Photons Using coherent Beam Stimulated Non-Collinear Parametric Down Conversion

TL;DR

This paper proposes a method to generate high-flux, high-fidelity NOON states using stimulated non-collinear parametric down conversion with coherent beams, significantly enhancing super-resolution in quantum interferometry.

Contribution

It introduces a novel scheme employing stimulated non-collinear down conversion with coherent light, allowing greater amplitude ratio flexibility and higher super-resolution than previous methods.

Findings

Achieved super-resolution exceeding previous schemes by orders of magnitude.

Demonstrated potential for arbitrary N NOON states with bright light sources.

Provided results for N=4 and 5 showing improved performance.

Abstract

We show how to reach high fidelity NOON states with a high count rate inside optical interferometers. Recently it has been shown that by mixing squeezed and coherent light at a beamsplitter it is possible to generate NOON states of arbitrary N with a fidelity as high as 94%. (Afek I. et al. Science 328, 879 (2010)). The scheme is based on higher order interference between "quantum" down-converted light and "classical" coherent light. However, this requires optimizing the amplitude ratio of classical to quantum light thereby limiting the overall count rate for the interferometric super-resolution signal. We propose using coherent-beam-stimulated non-collinear down converted light as input to the interferometer. Our scheme is based on stimulation of non-collinear parametric down conversion by two-mode coherent light. We have somehow a better flexibility of choosing the amplitude ratio in generating NOON states. This enables super-resolution intensity exceeding the previous scheme by many orders of magnitude. Therefore we hope to improve the magnitude of N-fold super-resolution in quantum interferometry for arbitrary N by using bright light sources. We give some results for N=4 and 5.