Exciting field phase effect on the entanglement death and birth phenomena for nonlinear coupler system

Issue title: Atomic and molecular nonlinear optics: Theory, Experiment and Computation A homage to the pioneering work of Stanisław Kielich (1925-1993)

Guest editors: G. Maroulis, T. Bancewicz, B. Champagne and A.D. Buckingham

Article type: Research Article

Authors: Kowalewska-Kudłaszyk, A.^{a; *} | Leoński, W.^b

Affiliations: [a] Nonlinear Optics Division, Department of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland | [b] Institute of Physics, University of Zielona Góra Prof.Z.Szafrana 4a, 65-516 Zielona Góra, Poland

Correspondence: [*] Corresponding author. E-mail: e-mail:annakow@amu.edu.pl.

Abstract: We consider time-evolution of the disentanglement process of once generated entangled qubit pair as a result of the phase variation of the pumping field. As a source of maximally entangled states we use the nonlinear coupler (two oscillators with Kerr-like nonlinearities) with nonlinear internal interactions. The coupler prepared in a maximally entangled state interacts afterwards with external reservoir of thermal character and pumping field as well. We show that the fact of the coupling with additional state (which can create additional entanglement with one of the 2-qubit system's previously entangled states) is an origin of interesting entanglement decay behaviour. We can observe shortening of both: entanglement death-time and entanglement birth caused by changing the phase of an external driving field.

DOI: 10.3233/JCM-2010-0331

Journal: Journal of Computational Methods in Sciences and Engineering, vol. 10, no. 3-6, pp. 439-445, 2010