Dynamics of entangled quantum optical system in independent media

Daniel F. Walls, Gerard J Milburn

М. Г. Кучеренко, A. P. Rusinov

In this paper, we consider the process of optical recording and decay of transient spatial structures in a system with a nonlinear response caused by incoherent saturation of three-level centers. The main attention is devoted to the thermal mechanism of phase recording in media with a temperature-independent heat conductivity. The relaxation of an inhomogeneous temperature field and the diffraction of a probe beam from the transient structure are studied. The designed theoretical model satisfactorily describes the obtained experimental results and allows the evolution of a temperature field to be viewed.

Marcelo Pereira de Almeida, Fernando de Melo, Malena O. Hor-Meyll +4 more

We demonstrate the difference between local, single-particle dynamics and global dynamics of entangled quantum systems coupled to independent environments. Using an all-optical experimental setup, we showed that, even when the environment-induced decay of each system is asymptotic, quantum entanglement may suddenly disappear. This "sudden death" constitutes yet another distinct and counterintuitive trait of entanglement.

P. Tombesi

C. Sudheesh, S. Lakshmibala, V. Balakrishnan

Masatoshi Nakatani, Ryōsuke Shimizu, Kazuki Koshino

We analyze the up conversion of a two-photon pulse having temporal entanglement on the basis of a full quantum formalism that treats both photons and optical media quantum mechanically. We derive a formula of the up-converted photon wave function, which is applicable to arbitrary input two-photon states for a three-level system, as the simplest second-order nonlinear optical system. As the input, we employ three kinds of temporally entangled two-photon pulses: correlated, uncorrelated, and anticorrelated. We observe the up-conversion efficiency and the temporal profile of the up-converted photon. Our results reveal the crossover behavior of the up conversion from anticorrelation to correlation and show how the temporal correlation in the input is reflected in the up-conversion process.