Preparation of Schr\"odinger cat quantum state using parametric down-conversion interaction

TL;DR

This paper proposes a new method for generating Schr"odinger cat states using parametric down-conversion and heralding measurements, potentially enabling practical implementation with high-Q microresonators.

Contribution

It introduces a novel conditional generation technique for bright Schr"odinger cat states leveraging degenerate parametric down-conversion and heralding measurement.

Findings

Method theoretically feasible with current high-Q microresonators

Enables generation of multi-photon Schr"odinger cat states

Utilizes heralding measurement for state preparation

Abstract

The Schr\"odinger cat (SC) states are important in quantum optics because of their non-Gaussian properties. We propose a novel method of conditional generation of bright (multi-photon) SC states that uses degenerate parametric down-conversion and heralding measurement of the photon number in the pump mode. We show that this method, in principle, could be implemented using the modern high-\(Q\) optical microresonators.