Enhancing nonclassical properties of quantum states of light using linear optics

TL;DR

This paper proposes a simple linear optics scheme to enhance nonclassical properties of light states, such as sub-Poissonian statistics and quadrature squeezing, by combining coherent and pure states at beam splitters.

Contribution

It introduces a versatile method using only linear optics and photodetectors to improve nonclassical features of quantum light states.

Findings

Enhanced sub-Poissonian statistics in output states

Improved quadrature squeezing demonstrated

Scheme applicable to various input states

Abstract

In this letter, we present a simple and versatile scheme for enhancing the nonclassical properties of light states using only linear optics and photodetectors. By combining a coherent state $|\alpha\rangle$ and an arbitrary pure state of light $|\phi\rangle$ (excluding coherent states) at two beam splitters, we show that the amplitude $\alpha$ of the coherent state can be tuned to filter out specific Fock components and generate states of light with enhanced nonclassical features. We provide two examples of input states and demonstrate the effectiveness of our scheme in enhancing the sub-Poissonian statistics or the quadrature squeezing of the output states.