Quantum effects of optical correlation in parametric generation

Abraham Abebe Kibret, Esayas Asfawu Beisie, Habtamu Dagnaw Mekonnen +2 more

M. K. Olsen, Lev I. Plimak, Antonio Zelaquett Khoury

Vladimir V. Kornienko, Kirill A. Kuznetsov, A.A. Leontyev +2 more

Quantum effect of parametric down-conversion is studied in a strongly frequency non-degenerate regime, when pairs of correlated optical and terahertz photons are generated along with parametric amplification and frequency conversion of thermal fluctuations and external radiation at terahertz frequencies. The terahertz photon fluxes emitted due to parametric down-conversion are registered. Direct incoherent nonlinear-optical detection is demonstrated for continuous wave sources at 0.2-0.4 THz.

L J Wang, C. K. Hong, Stephen R. Friberg

Correlated photons have been used in quantum optics for the generation of squeezed light, demonstration of quantum interference effects, quantum cryptography, Einstein-Podolsky-Rosen experiments and most recently, quantum teleportation. Usually, they are generated using χ (2) parametric processes to take advantage of large χ (2) nonlinearities and to wavelength separate the correlated photons from the pump photons. Here, we examine the generation of correlated photons using χ (3) parametric processes in optical fibres. We show that using such processes provides a simple and inexpensive correlated photon source readily compatible with communications technologies.

Rupamanjari Ghosh

A. Gatti, T. Corti, E. Brambilla

This work analyses the quantum properties of counterpropagating twin beams generated by a mirrorless optical parametric oscillator in the continuous-variable regime. Despite the lack of the filtering effect of a cavity, we show that in the vicinity of its threshold it may generate high levels of narrowband squeezing and Einstein-Podolsky-Rosen correlation, completely comparable to what can be obtained in standard optical parametric oscillators.