Nonequilibrium entanglement and noise in coupled qubits

We study the charge entanglement and noise spectrum of two Coulomb-coupled double quantum dots under stationary nonequilibrium transport conditions. In the transport regime, the entanglement exhibits a clear switching threshold and various limits due to suppression of tunneling by quantum Zeno localization or by an interaction-induced energy gap. We also discuss the interdot current correlation as a possible indicator of the entanglement in transport experiments.