Generation of nonclassical states of light via truncation of mixed states

TL;DR

This paper proposes an extended scheme for generating nonclassical, non-Gaussian light states by truncating mixed states using a quantum scissors setup that employs a nondegenerate parametric amplifier, a beam splitter, and photodetectors.

Contribution

It extends previous quantum scissors schemes to mixed input states, enabling the generation of nonclassical states with adjustable properties without needing Fock state preparation.

Findings

Generated states exhibit significant sub-Poissonian statistics.

States show non-Gaussian character with adjustable nonclassical properties.

Success probabilities depend on amplifier strength and beam splitter transmittance.

Abstract

A possible way of generating nonclassical states of light, especially non-Gaussian states, is via the truncation of a given state in the Fock basis. In recent work, we presented an alternative scheme for such quantum scissors [Phys. Rev. A 104, 033715 (2021)], employing a nondegenerate parametric amplifier, a beam splitter and photodetectors. An advantage of this setup is that it does not require the generation of Fock states beforehand, as in previous proposals. Here we extend this treatment to mixed input states. We show the possibilities of generating truncated states with either a maximum Fock number N or states having a minimum Fock number N. We discuss two specific examples of states to be truncated: i) the thermal state, and ii) the phase-diffused coherent state. In both cases, we show that the generated states can have significant sub-Poissonian statistics as well as non-Gaussian character. The degree of such nonclassical properties, as well as the success probabilities, can be changed by adjusting the parametric amplifier strength and the beam splitter transmittance.