Entanglement of resonantly coupled field modes in cavities with vibrating boundaries

Abstract

We study time dependence of various measures of entanglement (covariance entanglement coefficient, purity entanglement coefficient, normalized distance coefficient, entropic coefficients) between resonantly coupled modes of the electromagnetic field in ideal cavities with oscillating boundaries. Two types of cavities are considered: a three-dimensional cavity possessing eigenfrequencies ${\omega }_3=3{\omega }_1$, whose wall oscillates at the frequency ${\omega }_w=2{\omega }_1$, and a one-dimensional (Fabry--Perot) cavity with an equidistant spectrum ${\omega }_n=n{\omega }_1$, when the distance between perfect mirrors oscillates at the frequencies ${\omega }_1$ and $2{\omega }_1$. The behaviour of entanglement measures in these cases turns out to be completely different, although all three coefficients demonstrate qualitatively similar time dependences in each case (except for some specific situations, where the covariance entanglement coefficient, based on traces of covariance submatrices, seems to be essentially more sensitive to entanglement than other measures, which are based on determinants of covariance submatrices). Different initial states of the field are considered: vacuum, squeezed vacuum, thermal, Fock, and even/odd coherent states.

23 pages, 10 figures; to appear in Journal of Russian Laser Research

References in corpus (6)

• Alternative commutation relations, star products and tomography
• Resonant photon creation in a three dimensional oscillating cavity
• Nonstationary Casimir effect in cavities with two resonantly coupled modes
• Generalized uncertainty relations and coherent and squeezed states
• Dynamical Casimir effect without boundary conditions
• Inertial forces in the Casimir effect with two moving plates

Cited by in corpus (1)

• Photon generation from vacuum in nondegenerate cavities with regular and random periodic displacements of boundaries