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19 papers · 2 filters
An all-optical trap for a gram-scale mirror
T. Corbitt, Y. Chen, H. Mueller-Ebhardt +7
We report on a stable optical trap suitable for a macroscopic mirror, wherein the dynamics of the mirror are fully dominated by radiation pressure. The technique employs two freque…
Localization of atomic ensembles via superfluorescence
M. Macovei, J. Evers, C. H. Keitel +1
The sub-wavelength localization of an ensemble of atoms concentrated to a small volume in space is investigated. The localization relies on the interaction of the ensemble with a s…
Coherent control in a decoherence-free subspace of a collective multi-level system
M. Kiffner, J. Evers, C. H. Keitel
Decoherence-free subspaces (DFS) in systems of dipole-dipole interacting multi-level atoms are investigated theoretically. It is shown that the collective state space of two dipole…
Breakdown of the few-level approximation in collective systems
M. Kiffner, J. Evers, C. H. Keitel
The validity of the few-level approximation in dipole-dipole interacting collective systems is discussed. As example system, we study the archetype case of two dipole-dipole intera…
The computational complexity of PEPS
Norbert Schuch, Michael M. Wolf, Frank Verstraete +1
We determine the computational power of preparing Projected Entangled Pair States (PEPS), as well as the complexity of classically simulating them, and generally the complexity of…
Polarization-controlled single photons
T. Wilk, S. C. Webster, H. P. Specht +2
Vacuum-stimulated Raman transitions are driven between two magnetic substates of a rubidium-87 atom strongly coupled to an optical cavity. A magnetic field lifts the degeneracy of…