Engineering of oscillatory quantum states by parametric excitation

TL;DR

This paper presents a method to generate nonclassical oscillatory quantum states using a degenerate parametric oscillator with phase modulation, producing states with unique phase-space symmetry and superpositions at low excitation levels.

Contribution

It introduces a novel scheme combining Gaussian pulse excitation and phase modulation to engineer nonclassical states with specific symmetries in a dissipative quantum system.

Findings

Successful generation of nonclassical states with two-fold phase-space symmetry

Production of superpositions of Fock states at low excitation levels

Demonstration of state preparation in over-transient dissipative regime

Abstract

We consider preparation of nonclassical oscillatory states in a degenerate parametric oscillator combined with phase modulation. In this scheme intracavity oscillatory mode is excited by train of Gaussian laser pulses through degenerate down-conversion process and phase modulation element inserted in a cavity leads to anharmonicity of oscillatory mode. We demonstrate production of nonclassical oscillatory states with two-fold symmetry in phase-space including the superposition of Fock states and quantum localized states on the level of few excitation numbers and in over-transient dissipative regime.