Portal de Periódicos da CAPES

Ideal pairing of the Stokes and anti-Stokes photons in the Raman process

2021; American Physical Society; Volume: 103; Issue: 3 Linguagem: Inglês

10.1103/physreva.103.033708

2469-9942

Kishore Thapliyal, Jan Peřina,

Quantum Mechanics and Applications

A quantum model of the Raman process with the independent Stokes and anti-Stokes nonlinear interactions is developed to study nonclassical correlations between the photons in the Stokes and anti-Stokes fields. The role of the laser pump amplitude, the ratio of the Stokes and anti-Stokes coupling constants, and the population and losses of the vibrational mode in forming the correlations is elucidated. The ${g}^{(2)}$ intensity cross-correlation function, noise-reduction factor, two-mode principal squeezing variance, logarithmic negativity, nonclassicality depth, steering parameter, and the Bell parameter are analyzed side by side to shed light to the correlations between the Stokes and anti-Stokes fields. Conditions for having the Stokes and anti-Stokes fields composed of only photon pairs, similarly as it occurs in twin beams in parametric down-conversion, are revealed. They allow for nonzero mean thermal phonon numbers.