Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Nichtlineare optische Effekte und Lichtquellen I
Q 4.2: Vortrag
Montag, 19. März 2007, 10:45–11:00, 5J
Strongly Interacting Polaritons in Coupled Arrays of Cavities — •Michael Hartmann1,2, Fernando Brandao1,2, and Martin Plenio1,2 — 1Institute for Mathematical Sciences, Imperial College London, United Kingdom — 2QOLS, Blackett Laboratory, Imperial College London, United Kingdom
The experimental observation of quantum phenomena in strongly correlated many particle systems is difficult because of the short length- and timescales involved. Obtaining at the same time detailed control of individual constituents appears even more challenging and thus to date inhibits employing such systems as quantum information processing devices.
Substantial progress to overcome these problems has been achieved with cold atoms in optical lattices, where a detailed control of collective properties is feasible. However it is very difficult to address and hence control or measure individual sites.
In this work, we demonstrate that polaritons, combined atom and photon excitations, in an array of cavities can form a strongly interacting many body system governed by a Bose-Hubbard Hamiltonian. In this system, individual particles can, by construction, be controlled and measured. It therefore allows to create inhomogeneous systems where different phases may coexists in adjacent spatial regions. Furthermore, the on-site potential can be attractive, where particles are much more delocalised than in superfluids and highly entangled WN states can be generated. Finally not only an effective Bose-Hubbard Hamiltonian might be created but several different many body systems.