△Generation of quantum correlated photon number squeezed twin beams using a dual-port SHG resonator

Oo-Kaw Lim, Mark E. Saffman

Using a self-consistent squeezing analysis, we show that a pair of entangled twin beams can be generated in the harmonic output from a dual ported frequency doubling cavity.

Orhan Aytür

Oo-Kaw Lim, Mark E. Saffman

A dual ported frequency doubling cavity can be used to generate twin beams in the harmonic output with strong quantum correlations, even in the framework of a plane wave model. For a singly resonant cavity, the steady state solution of the fundamental field has to be self-consistent after propagating one round trip.

John G. Rarity, P. R. Tapster, Juan Ariel Levenson +7 more

Oo-Kaw Lim, Mark E. Saffman

We show that nonclassical intensity correlations and quadrature entanglement can be generated by frequency doubling in a resonator with two output ports. We predict twin-beam intensity correlations $6\phantom{\rule{0.3em}{0ex}}\mathrm{dB}$ below the coherent-state limit, and that the product of the inference variances of the quadrature fluctuations gives an Einstein-Podolsky-Rosen correlation coefficient of ${V}_{\mathrm{EPR}}=0.64<1$, using the criterion of Reid [Phys. Rev. A 40, 913 (1989)]. 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.

János A. Bergou, Ning Lü, Marlan O. Scully