Intensity correlations and entanglement by frequency doubling in a dual ported resonator

Abstract

We show that non-classical intensity correlations and quadrature entanglement can be generated by frequency doubling in a resonator with two output ports. We predict twin-beam intensity correlations 6 dB below the coherent state limit, and that the product of the inference variances of the quadrature fluctuations gives an Einstein-Podolsky-Rosen (EPR) correlation coefficient of V_EPR = 0.6 < 1. Comparison with an entanglement source based on combining two frequency doublers with a beam splitter shows that the dual ported resonator provides stronger entanglement at lower levels of individual beam squeezing. Calculations are performed using a self-consistent propagation method that does not invoke a mean field approximation. Results are given for physically realistic parameters that account for the Gaussian shape of the intracavity beams, as well as intracavity losses.

12 pages, 9 figures, normalization corrected, fig 3 and fig 7 updated

References in corpus (5)

• Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables
• Demonstration of quantum telecloning of optical coherent states
• Critical fluctuations and entanglement in the nondegenerate parametric oscillator
• Harmonic entanglement with second-order non-linearity
• Generation of twin beams from an optical parametric oscillator pumped by a frequency-doubled diode laser

Cited by in corpus (3)

• The Einstein-Podolsky-Rosen paradox: from concepts to applications
• Observation of twin beam correlations and quadrature entanglement by frequency doubling in a two-port resonator
• Spontaneously induced atom-radiation entanglement in an ensemble of two-level atoms