Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1544161 | Physica E: Low-dimensional Systems and Nanostructures | 2015 | 11 Pages |
Abstract
We have studied dynamical properties of an exactly solvable quantum coupled double-well (DW) system with Razavy's hyperbolic potential. With the use of four kinds of initial wavepackets, the correlation function Î(t) and the concurrence C(t) which is a typical measure of the entanglement in two qubits, are calculated. We obtain the orthogonality time Ï which signifies a time interval for an initial state to evolve to its orthogonal state, and the temporal average of Cav(=ãC(t)2ã). The coupling dependence of Ï and the concurrence [Cav or C(0)], and the relation between Ï and the concurrence are investigated. Our calculations have shown that the evolution speed measured by Ï-1 is not necessarily increased with increasing the concurrence in coupled DW systems.
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Hideo Hasegawa,