# Generating strong anti-bunching by interfering with coherent states

## TL;DR

This paper proposes a simple interferometric setup mixing coherent and non-negative Wigner function states to generate strong anti-bunched light, revealing an interference mechanism related to unconventional photon blockade and enabling weak squeezing measurement.

## Contribution

It introduces a novel method for producing strong anti-bunching by interfering coherent states with states having non-negative Wigner functions, expanding quantum light source capabilities.

## Key findings

- Demonstrates strong anti-bunching via interference with coherent states
- Links the effect to unconventional photon blockade
- Provides a technique to measure weak squeezing

## Abstract

The second order correlation function is traditionally used to characterize the photon statistics and to distinguish between classical and quantum states of light. In this article we study a simple setup offering the possibility to generate strong anti-bunched light. This is achieved by mixing on a beam splitter a coherent state with a state with a non-negative Wigner function, such as squeezed states or weak Schr\"odinger cat states. We elucidate the interference mechanism generating such strong antibunching and relate it to unconventionnal photon blockade. We also detail how this effect can be used to measure weak squeezing.