<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures"^^ . "This thesis reports on the experimental realization of an elementary building\r\nblock for analog quantum simulation of a U(1) lattice gauge theory in a mixture\r\nof two bosonic quantum gases. Experimentally, the building block is realized\r\nby Bose-Einstein condensates of lithium (7Li) and sodium (23Na) confined in a\r\nsingle optical dipole trap. Gauge and matter degrees of freedom are mapped in\r\nthis system onto the internal states of the atomic species. The necessary U(1)\r\ngauge invariance is realized via heteronuclear spin changing collisions (SCC)\r\nbetween both species.\r\nThe building block represents an important stepstone towards quantum simulation\r\nof extended lattice gauge theories as, within the same setting, it features\r\nsystematic protection of gauge invariance, a realistic approach of the continuum\r\nlimit for gauge fields and the potential for scalability.\r\nUsing SCC, systematic protection of gauge invariance in the system is achieved\r\nby exploiting the inherent angular momentum conservation in the atomic mixture.\r\nThe continuum limit of gauge fields is recovered in the framework of quantum\r\nlink models by working with Bose-Einstein condensates with high atom numbers\r\nin the order of 10^5. The building block can be scaled up to an extended U(1) lattice\r\ngauge theory by arranging individual building blocks on the sites of an optical\r\nlattice and connecting them via Raman-assisted tunneling.\r\nGreat tunability of our experimental building block is demonstrated by studying\r\nSCC dynamics as a function of various experimental parameters. We observe\r\ncoherent SCC interactions between both species after an initialization quench.\r\nFurthermore, we recorded the SCC resonance as a function of this initialization\r\nquench and the offset magnetic field. We present a theoretical framewok for the\r\nbuilding block model based on a mean field theory with a phenomenological\r\ndecoherence term. Within this framework the experimental SCC measurements\r\nare excellently described, identifying our experimental system as a faithful representation\r\nof the building block.\r\nOur results open up the possibility for extended lattice gauge theories based\r\non multiple building blocks. These systems will allow for quantum simulation\r\nof gauge theories with the potential to address important questions in modern\r\nphysics that can currently not be simulated by classical computational techniques."^^ . "2020" . . . . . . . "Alexander"^^ . "Mil"^^ . "Alexander Mil"^^ . . . . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (PDF)"^^ . . . "phd_alexander_mil.pdf"^^ . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (Other)"^^ . . . . . . "small.jpg"^^ . . . "Experimental realization of U(1) gauge invariance in\r\nultracold atomic mixtures (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #28454 \n\nExperimental realization of U(1) gauge invariance in \nultracold atomic mixtures\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .