High-NOON States with High Flux of Photons Using Coherent Beam Stimulated Noncollinear Parametric Down Conversion

Abstract EN

We show how to reach high fidelity NOON states with a high count rate inside optical interferometers.

Previously, it has been shown that by mixing squeezed and coherent light at a beam splitter, it is possible to generate NOON states of arbitrary N with a fidelity as high as 94%.

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 noncollinear two-mode down-converted light as input to the interferometer.

Our scheme is based on the stimulation of noncollinear parametric down conversion by coherent light sources.

We get 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 using bright light sources.

We give improved results for N = 4 and 5.