title: Transient and steady-state entanglement mediated by three-dimensional plasmonic waveguides.
abstract: Entanglement between two qubits (two level atoms) mediated by surface plasmons in three-dimensional plasmonic waveguides is studied using a quantum master equation formalism. Two types of waveguides, a nanowire and a V-shaped channel cut in a flat metal plane, are considered. The Green functions for the waveguides, which rigorously describes the dissipative qubit environment, are calculated numerically using a direct finite-difference time-domain (FDTD) solution of Maxwell's equations. Finite-length effects are shown to play a crucial role in enhancing entanglement, and resonant-length plasmonic waveguides can provide higher entanglement between qubits than infinite-length waveguides. It is also shown that coupling slots can improve entanglement via stronger qubit-waveguide coupling, for both the infinite- and finite-waveguide cases. The formalism used in the paper can be applied to a wide range of plasmonic waveguides.
authors.forename: S Ali Hassani
authors.initials: SA
authors.lastname: Gangaraj
authors.forename: Andrei
authors.initials: A
authors.lastname: Nemilentsau
authors.forename: George W
authors.initials: GW
authors.lastname: Hanson
authors.forename: Stephen
authors.initials: S
authors.lastname: Hughes