title: Quantum entanglement in coupled lossy waveguides.
abstract: We investigate the viability of coupled waveguides as basic units of quantum circuits. We study entanglement when the waveguides are fed in by light produced by a down-converter working either in low gain limit or under large gain. We present explicit analytical results for the measure of entanglement in terms of the logarithmic negativity for a variety of input states. We also address the effect of loss on entanglement dynamics of waveguide modes. Our results indicate that the waveguide structures are reasonably robust against the effect of loss and thus quite appropriate for quantum architectures as well as for the study of coherent phenomena like random walks. Our analysis is based on realistic structures used currently.
authors.affiliation: Department of Physics, Oklahoma State University,Stillwater, Oklahoma 74078, USA. amit.rai@okstate.edu
authors.forename: Amit
authors.initials: A
authors.lastname: Rai
authors.forename: Sumanta
authors.initials: S
authors.lastname: Das
authors.forename: G S
authors.initials: GS
authors.lastname: Agarwal
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation