Production and applications of non-Gaussian quantum states of light

TL;DR

This review discusses recent advances in generating and utilizing non-Gaussian quantum states of light, highlighting their importance in quantum physics and information processing, through various experimental and theoretical methods.

Contribution

It provides a comprehensive overview of methods to produce non-Gaussian states and their applications, emphasizing both fundamental insights and practical implementations.

Findings

Development of techniques for generating non-Gaussian states

Experimental demonstrations of non-Gaussian state applications

Enhanced capabilities in quantum information processing

Abstract

This review covers recent theoretical and experimental efforts to extend the application of the continuous-variable quantum technology of light beyond "Gaussian" quantum states, such as coherent and squeezed states, into the domain of "non-Gaussian" states with negative Wigner functions. Starting with basic Gaussian nonclassicality associated with single- and two-mode vacuum states produced by means of parametric down-conversion and applying a set of standard tools, such as linear interferometry, coherent state injection, and conditional homodyne and photon number measurements, one can implement a large variety of optical states and processes that are relevant in fundamental quantum physics as well as quantum optical information processing. We present a systematic review of these methods, paying attention to both fundamental and practical aspects of their implementation, as well as a comprehensive overview of the results achieved therewith.