Huck, AlexanderSmolka, StephanLodahl, PeterSorensen, Anders SBoltasseva, AlexandraJanousek, JiriAndersen, U L2015-12-132015-12-130031-9007http://hdl.handle.net/1885/79983We report on the efficient generation, propagation, and reemission of squeezed long-range surface-plasmon polaritons in a gold waveguide. Squeezed light is used to excite the nonclassical surface-plasmon polaritons, and the reemitted quantum state is fully characterized by complete quantum tomographic reconstruction of the density matrix. We find that the plasmon-assisted transmission of nonclassical light in metallic waveguides can be described by a beam splitter relation. This result is explained theoretically.Keywords: Beam splitters; Density matrix; Metallic waveguide; Non-classical lights; Quantum state; Re-emission; Squeezed light; Surface plasmon polaritons; Surface plasmons; Tomographic reconstruction; Heat radiation; Optical data storage; Phonons; Photons; Plasmon200910.1103/PhysRevLett.102.2468022016-02-24