title: Generating maximum entanglement under asymmetric couplings to surface plasmons.
abstract: Generating entangled states is a vital ingredient for quantum information engineering. Here, we investigate the entanglement generation between two quantum dots coupled to nanoring surface plasmons with asymmetric coupling strength g(1) and g(2). The dynamics of concurrence C is obtained by solving the corresponding master equation. High entanglement can be generated at appropriate times through the scatterings of the incident field and its scattered field. Furthermore, we find that maximum entanglement can be created when r≡g(1)/g(2) is the ratio of odd numbers. Contrary to intuition, relative high entanglement (C≃1) can remain even if the ratio r is far off the required values, which is useful in real experiments.
authors.affiliation: Department of Physics and National Center for Theoretical Sciences, National Cheng-Kung University, Tainan City 701, Taiwan.
authors.forename: Guang-Yin
authors.initials: GY
authors.lastname: Chen
authors.forename: Che-Ming
authors.initials: CM
authors.lastname: Li
authors.forename: Yueh-Nan
authors.initials: YN
authors.lastname: Chen