Multifractal entanglement of copropagating electromagnetic fields
Departamento de Física, Universidade Federal de Alagoas -
Maceió AL 57072/970, Brazil
Accepted: 30 November 1995
The entanglement properties of two initially coherent electromagnetic-field modes copropagating through a lossless nonlinear medium are investigated. Disentangled states are observed to occur periodically. By taking a suitable set of nonlinear parameters, these states become a macroscopically well-distinguishable coherent superposition. Between two consecutive disentanglements the modes reach partial disentanglements, with the purity measure evolving into a multifractal measure for large mean photon number. Following standard statistical techniques, the singularity spectrum of the purity measure is obtained to characterize its universal scaling properties.
PACS: 42.50.Dv – Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements / 42.50.Ne – Dynamics of nonlinear optical systems; optical instabilities, optical chaos, and optical spatio-temporal dynamics / 05.45.+b – Theory and models of chaotic systems
© EDP Sciences, 1996