We investigate entanglement between electrons in serially coupled double quantum dots attached to noninteracting leads. In addition to local repulsion we consider the influence of capacitive inter-dot interaction. We show how the competition between extended Kondo and local singlet phases...

We study quantum entanglement in a single-level quantum dot in the linear-response regime. The results show, that the maximal quantum value of the conductance 2e<Superscript>2</Superscript>/h not always match the maximal entanglement. The pairwise entanglement between the quantum dot and the nearest atom of the lead is...</superscript>

The critical behaviors of the entropy correlation effects in the one dimensional J<Subscript>1</Subscript>-J<Subscript>2</Subscript> Heisenberg model are studied. It is shown that the mutual information or the correlation entropy captures the key features of information about critical fluctuations and can be used to quantify the quantum and...</subscript></subscript>

We propose a scheme to eliminate the effect of non-nearest-neighbor qubits in preparing cluster state with double-dot molecules. As the interaction Hamiltonians between qubits are Ising-model and mutually commute, we can get positive and negative effective interactions between qubits to cancel...