Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 50: Quantum Effects: Entanglement and Decoherence
Q 50.3: Vortrag
Donnerstag, 17. März 2011, 11:00–11:15, SCH A01
Effects of retardation on sudden death and revival of entanglement — •Qurrat Ul-ain1, Zbigniew Ficek2, and Jörg Evers1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2The National Centre for Mathematics and Physics, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
In the standard setup of atoms coupled to a cavity, a finite time is required by light to travel between the atoms and the cavity boundaries. In suitable parameter regimes, these retardation effects can affect the time evolution of the combined system of atoms and cavity field to a large degree [1].
Here, we study the effects of retardation on the entanglement dynamics of a system of two two-level atoms placed inside a one-dimensional ring cavity. For this, we calculate the time evolution of the concurrence [2], which quantifies the entanglement between the two atoms. We indentify suitable parameter ranges for the study of retardation effects, analyze sudden death and revival of entanglement [3] in the presence of retardation, and interpret the obtained results in terms of the traveling time of light between the atoms and the cavity mirrors.
[1] E. V. Goldstein and P. Meystre, Phys. Rev. A 56, 5135 (1997).
[2] W. K. Wootters, Phys. Rev. Lett. 80, 2245 (1998).
[3] T. Yu and J. H. Eberly, Phys. Rev. Lett. 93, 140404 (2004).