Polarization Squeezing in Degenerate Parametric Amplification of Coherent Light

TL;DR

This paper investigates polarization squeezing in coherent light using degenerate parametric amplification, demonstrating high squeezing levels achievable even at low intensities through phase control.

Contribution

It introduces a specific nonlinear Hamiltonian approach to polarization squeezing and shows conditions for high squeezing at low beam intensities.

Findings

Polarization squeezing can be very high with minimal deviation from ideal.

Squeezing is achievable at low beam intensities with proper phase conditions.

The degree of polarization squeezing can be less than one by a very small amount.

Abstract

We study polarization squeezing of a light beam initially in the coherent state using the nonlinear interaction hamiltonian $ H=k\big(\hat a_{x}^{\dagger2}+{\hat a_{x}}^2\big)$. For the degree of polarization squeezing, we use a definition written in the final form by the authors and also used in earlier papers. We find that the polarization squeezing can be very high and the degree of polarization squeezing can be less than unity by a very small amount. We achieve the polarization squeezing even for very low beam intensity under some conditions involving phase angles in the polarization modes.