Physics – Quantum Physics
Scientific paper
2006-03-09
Phys. Rev. A 74, 023816 (2006)
Physics
Quantum Physics
12 pages, 9 figures, normalization corrected, fig 3 and fig 7 updated
Scientific paper
10.1103/PhysRevA.74.023816
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.
Lim Oo-Kaw
Saffman Mark
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