Squeezed and non-classical light

F. A. Popp, Jianhong Chang, A Herzog +2 more

Joan A. Vaccaro, David Thomas Pegg

Various authors have shown that for a particular type of atomic light amplifier, which can be identified as an unsqueezed amplifier, squeezing in the output is destroyed for gains greater than 2, and if the input is classical light then there are no non-classical effects (squeezing or sub-Poisson photon statistics) in the output for any value of the gain; however, these results are not necessarily true for a squeezed amplifier. Here we investigate single-stage and multi-stage squeezed atomic light amplifiers and show that the above non-classical effects can occur even with a coherent-state input. We find that the output of a multistage squeezed amplifier can be squeezed in principle for any desired gain, and that when this amplifier is used as an attenuator, output light can in principle be produced with any desired amount of squeezing for any input.

P. Tombesi, Edward R. Pike

M. Kárská, Jan Peřina

Photon statistics of stimulated Raman scattering of squeezed light are considered including additive noise. The phonon system is assumed to be in chaotic or squeezed chaotic states. The influence of nonlinear dynamics is established on the initial non-classical features of light adopting quasi-distribution related to anti-normal ordering, photocount distribution, its factorial moments and principal squeezing parameter. It is shown that the initial non-classical effects are increased by the nonlinear dynamics provided that the Stokes mode is less amplified than the anti-Stokes mode is damped, whereas in the opposite case the non-classical effects are swiftly smoothed out. The frequency detuning can be optimized to have maximum non-classical effects, which can periodically return. However, above a certain bound the non-classical effects are missing with frequency detuning, and also with increasing phonon number, even if the phonon system is squeezed. Small initial squeezing can be increased by the nonlinear dynamics, whereas strong squeezing can only be diminished.

Pierre Meystre, Murray Sargent

Sitotaw Eshete

In this paper, we have shown that the mathematical expressions for a new integrated quantum optical system which encompass laser light and twin light beams.Our finding shows that the quadrature variance and quadrature squeezing for the superposed light beam is the sum of the quadrature variance and the average of the quadrature squeezing of the component systems respectively.We also found that the presence of the twin light beam improves the non-classicality of the system.Keywords： Laser Light, Quadrature Fluctuation, Squeezing, Twin Light Beams