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Creation of discrete solitons and observation of the Peierls-Nabarro barrier in Bose-Einstein Condensates
V. Ahufinger, A. Sanpera, P. Pedri +2
We analyze the generation and mobility of discrete solitons in Bose-Einstein condensates confined in an optical lattice under realistic experimental conditions. We discuss first th…
Witnessing multipartite entanglement
Mohamed Bourennane, Manfred Eibl, Christian Kurtsiefer +7
We present the experimental detection of genuine multipartite entanglement using entanglement witness operators. To this aim we introduce a canonical way of constructing and decomp…
Finite size effects in entangled rings of qubits
T. Meyer, U. V. Poulsen, K. Eckert +2
We study translationally invariant rings of qubits with a finite number of sites N, and find the maximal nearest-neighbor entanglement for a fixed z component of the total spin. Fo…
Second Order Correlation Function of a Phase Fluctuating Bose-Einstein Condensate
L. Cacciapuoti, D. Hellweg, M. Kottke +6
The coherence properties of phase fluctuating Bose-Einstein condensates are studied both theoretically and experimentally. We derive a general expression for the N-particle correla…
Entanglement as precondition for secure quantum key distribution
Marcos Curty, Maciej Lewenstein, Norbert Lütkenhaus
We demonstrate that a necessary precondition for unconditionally secure quantum key distribution is that sender and receiver can use the available measurement results to prove the…
Mean-field theory of Bose-Fermi mixtures in optical lattices
H. Fehrmann, M. A. Baranov, B. Damski +2
We determine the phase diagram of a mixture of ultracold bosons and polarized fermions placed in an optical lattice using mean field theory. In the limit of strong atom-atom intera…
Continuous optical loading of a Bose-Einstein Condensate in the Thomas-Fermi regime
F. Floegel, L. Santos, M. Lewenstein
We discuss the optical loading of a Bose-Einstein condensate in the Thomas-Fermi regime. The condensate is loaded via spontaneous emission from a reservoir of excited-state atoms.…
Roton-maxon spectrum and stability of trapped dipolar condensates
L. Santos, G. V. Shlyapnikov, M. Lewenstein
We find that pancake dipolar condensates can exhibit a roton-maxon character of the excitation spectrum, so far only observed in superfluid helium. We also obtain a condition for t…