Polarization squeezing in a four-level system

Abstract

We present a theoretical study of an ensemble of X-like 4-level atoms placed in an optical cavity driven by a linearly polarized field. We show that the self-rotation (SR) process leads to polarization switching (PS). Below the PS threshold, both the mean field mode and the orthogonal vacuum mode are squeezed. We provide a simple analysis of the phenomena responsible for the squeezing and trace the origin of vacuum squeezing not to SR, but to crossed Kerr effect induced by the mean field. Last, we show that this vacuum squeezing can be interpreted as polarization squeezing.

21 pages, 10 figures, submitted to J. Opt. B for Special Issue on Quantum Optics and Quantum Entanglement (IQEC 2002)

References in corpus (5)

• Polarization squeezing and continuous-variable polarization entanglement
• Experimental demonstration of continuous variable polarization entanglement
• Polarization Squeezing of Continuous Variable Stokes Parameters
• Vacuum Squeezing in Atomic Media via Self-Rotation
• Quantum techniques using continuous variables of light

Cited by in corpus (9)

• Polarization multistability of cavity polaritons
• Continuous variable entanglement using cold atoms
• Polarization squeezing with cold atoms
• Can optical squeezing be generated via polarization self-rotation in a thermal vapour cell?
• Spatial state Stokes-operator squeezing and entanglement for optical beams
• Entanglement and squeezing in a two-mode system: theory and experiment
• Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
• Teleportation of continuous variable polarisation states
• Non-Gaussian two-mode squeezing and continuous variable entanglement of linearly and circularly polarized light beams interacting with cold atoms