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5 papers · 2 filters
Slow transport by continuous time quantum walks
Oliver Muelken, Alexander Blumen
Continuous time quantum walks (CTQW) do not necessarily perform better than their classical counterparts, the continuous time random walks (CTRW). For one special graph, where a re…
Double-EIT ground-state laser cooling without blue-sideband heating
Joerg Evers, Christoph H. Keitel
We discuss a laser cooling scheme for trapped atoms or ions which is based on double electromagnetically induced transparency (EIT) and makes use of a four-level atom in tripod con…
Decoherence alias Loschmidt echo of the environment
T. Gorin, T. Prosen, T. H. Seligman +1
Entanglement between a quantum system and its environment leads to loss of coherence in the former. In general, the temporal fate of coherences is complicated. Here, we establish t…
Genuine quantum trajectories for non-Markovian processes
Heinz-Peter Breuer
A large class of non-Markovian quantum processes in open systems can be formulated through time-local master equations which are not in Lindblad form. It is shown that such process…
Non-Markovian dynamics in a spin star system: Exact solution and approximation techniques
Heinz-Peter Breuer, Daniel Burgarth, Francesco Petruccione
The reduced dynamics of a central spin coupled to a bath of N spin-1/2 particles arranged in a spin star configuration is investigated. The exact time evolution of the reduced dens…