# Heralded dissipative preparation of nonclassical states in a Kerr oscillator

## TL;DR

This paper introduces a heralded method for preparing nonclassical states in a Kerr oscillator by using continuous photon counting, enabling the creation of states with negative Wigner functions that are not achievable in steady state.

## Contribution

The paper proposes a novel heralded state preparation protocol for nonlinear open quantum systems based on photon counting measurements.

## Key findings

- Successfully creates nonclassical states with negative Wigner functions
- Demonstrates the protocol's effectiveness in a Kerr oscillator system
- Shows the ability to generate measurement-induced pseudo-steady states

## Abstract

We present a heralded state preparation scheme for driven nonlinear open quantum systems. The protocol is based on a continuous photon counting measurement of the system's decay channel. When no photons are detected for a period of time, the system has relaxed to a measurement-induced pseudo-steady state. We illustrate the protocol by the creation of states with a negative Wigner function in a Kerr oscillator, a system whose unconditional steady state is strictly positive.