title: Persistent quantum beats and long-distance entanglement from waveguide-mediated interactions.
abstract: We study photon-photon correlations and entanglement generation in a one-dimensional waveguide coupled to two qubits with an arbitrary spatial separation. To treat the combination of nonlinear elements and 1D continuum, we develop a novel Green function method. The vacuum-mediated qubit-qubit interactions cause quantum beats to appear in the second-order correlation function. We go beyond the Markovian regime and observe that such quantum beats persist much longer than the qubit lifetime. A high degree of long-distance entanglement can be generated, increasing the potential of waveguide-QED systems for scalable quantum networking.
authors.affiliation: Department of Physics, Duke University, P.O. Box 90305, Durham, North Carolina 27708, USA.
authors.forename: Huaixiu
authors.initials: H
authors.lastname: Zheng
authors.affiliation: Department of Physics, Duke University, P.O. Box 90305, Durham, North Carolina 27708, USA.
authors.forename: Harold U
authors.initials: HU
authors.lastname: Baranger