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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum Information: Concepts and Methods IV / Photons and Nonclassical Light I

Q 52.8: Vortrag

Donnerstag, 11. März 2010, 15:45–16:00, E 214

Long-range interaction of single atoms through nanowires with nontrivial topology of couplings — •David Dzsotjan^1,2 and Michael Fleischhauer¹ — ¹Technical University of Kaiserslautern, Germany — ²Research Institute for Particle and Nuclear Physics, Budapest, Hungary

We investigate the long-range coupling of individual atoms placed close to metallic nanowires. Putting the emitter close to the surface of the wire, a strong Purcell effect can be observed: with very high probability, the emitter will decay into guided modes of the wire, the so-called surface plasmons [1], with a rate exceeding that of free space by a large factor. The strength of the coupling originates from the fact that surface plasmon modes have an extremely small mode volume, being confined at around the surface of the nanowire. There is an optimal, sub-wavelength emitter-wire distance where the coupling to the plasmon is maximal due to the losses originating from circulating currents. When two emitters are placed along the wire (both strongly coupled to a single surface plasmon mode), we observe a strong, wire-mediated long-range interaction between the emitters. As a result of this, super- and subradiance can occur over distances large compared to the resonant wavelength. Here, the states with enhanced or suppressed decay rate are the well-known symmetric or anti-symmetric Dicke states. Taking more atoms and coupling them to a wire network with a nontrivial coupling topology leads to interesting entangled states being the subradiant states of the system.

[1] D.E. Chang et al, Phys. Rev. Lett. 97, 053002 (2006); Phys. Rev. B 76, 035420 (2007)