The Minimum-Uncertainty Squeezed States for for Atoms and Photons in a Cavity

TL;DR

This paper introduces a six-parameter family of minimum-uncertainty squeezed states for harmonic oscillators, with explicit constructions, analysis of their properties, and applications in quantum optics and cavity QED.

Contribution

It provides a new class of generalized squeezed states derived via symmetry group actions, with explicit formulas and potential applications in quantum technologies.

Findings

Product of variances reaches minimum only during squeezing events.

Explicit Wigner functions for the generalized states are derived.

Overlap coefficients with Fock states are expressed using hypergeometric functions.

Abstract

We describe a six-parameter family of the minimum-uncertainty squeezed states for the harmonic oscillator in nonrelativistic quantum mechanics. They are derived by the action of corresponding maximal kinematical invariance group on the standard ground state solution. We show that the product of the variances attains the required minimum value 1/4 only at the instances that one variance is a minimum and the other is a maximum, when the squeezing of one of the variances occurs. The generalized coherent states are explicitly constructed and their Wigner function is studied. The overlap coefficients between the squeezed, or generalized harmonic, and the Fock states are explicitly evaluated in terms of hypergeometric functions. The corresponding photons statistics are discussed and some applications to quantum optics, cavity quantum electrodynamics, and superfocusing in channeling scattering are mentioned. Explicit solutions of the Heisenberg equations for radiation field operators with squeezing are found.