Quantum entanglement of space domains occupied by interacting electrons

摘要

Spin-entanglement of two electrons occupying two spatial re-gions – domains – is expressed in a compact form in terms ofspin-spin correlation functions. The power of the formalism isdemonstrated on several examples ranging from generation of entanglement by scattering of two electrons to the entangle-ment of a pair of qubits represented by a double quantum dotcoupled to leads. In the latter case the collapse of entanglementdue to the Kondo effect is analyzed.