Controllable coupling and quantum correlation dynamics of two double quantum dots coupled via a transmission line resonator |
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Authors: | Q Q Wu Q S Tan L M Kuang |
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Institution: | 1.Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics,Hunan Normal University,Changsha,P.R. China;2.Department of Physics and electronics,Hunan Institute of Science and Technology,Yueyang,P.R. China |
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Abstract: | We propose a theoretical scheme to generate a controllable and switchable coupling
between two double-quantum-dot (DQD) spin qubits by using a transmission line resonator
(TLR) as a bus system. We study dynamical behaviors of quantum correlations described by
entanglement correlation (EC) and discord correlation (DC) between two DQD spin qubits
when the two spin qubits and the TLR are initially prepared in X-type
quantum states and a coherent state, respectively. We demonstrate that in the EC death
regions there exist DC stationary states in which the stable DC amplification or
degradation can be generated during the dynamical evolution. It is shown that these DC
stationary states can be controlled by initial-state parameters, the coupling, and
detuning between qubits and the TLR. We reveal the full synchronization and
anti-synchronization phenomena in the EC and DC time evolution, and show that the EC and
DC synchronization and anti-synchronization depends on the initial-state parameters of the
two DQD spin qubits. It is shown that the initial quantum correlation may be suppressed
completely when the evolution time approaches to the infinity in the presence of
dissipation. These results shed new light on dynamics of quantum correlations. |
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