Spin entangled two-particle dark state in quantum transport through coupled quantum dots

摘要

We present a transport setup of coupled quantum dots that enables thecreation of spatially separated spin-entangled two-electron dark states. Weprove the existence of an entangled transport dark state by investigating thesystem Hamiltonian without coupling to the electronic reservoirs. In thetransport regime the entangled dark state which corresponds to a singlet has astrongly enhanced Fano factor compared to the dark state which corresponds to amixture of the triplet states. Furthermore we calculate the concurrence of theoccupying electrons to show the degree of entanglement in the transport regime.