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14 papers · 1 filter
Quantum walks and quantum simulations with Bloch oscillating spinor atoms
D. Witthaut
We propose a scheme for the realization of a quantum walker and a quantum simulator for the Dirac equation with ultracold spinor atoms in driven optical lattices. A precise control…
Nonlinear Landau-Zener tunneling in quantum phase space
F. Trimborn, D. Witthaut, V. Kegel +1
We present a detailed analysis of the Landau-Zener problem for an interacting Bose-Einstein condensate in a time-varying double-well trap, especially focussing on the relation betw…
Automatic Hermiticity
Keiichi Nagao, Holger Bech Nielsen
We study a diagonalizable Hamiltonian that is not at first hermitian. Requirement that a measurement shall not change one Hamiltonian eigenstate into another one with a different e…
Opto-mechanical transducers for long-distance quantum communication
K. Stannigel, P. Rabl, A. S. Sørensen +2
We describe a new scheme to interconvert stationary and photonic qubits which is based on indirect qubit-light interactions mediated by a mechanical resonator. This approach does n…
Quantum memory for entangled two-mode squeezed states
K. Jensen, W. Wasilewski, H. Krauter +7
A quantum memory for light is a key element for the realization of future quantum information networks. Requirements for a good quantum memory are (i) versatility (allowing a wide…
Dissipation induced coherence and stochastic resonance of an open two-mode Bose-Einstein condensate
D. Witthaut, F. Trimborn, S. Wimberger
We discuss the dynamics of a Bose-Einstein condensate in a double-well trap subject to phase noise and particle loss. The phase coherence of a weakly-interacting condensate, experi…