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10 papers · 2 filters
Coherence in Microchip Traps
Philipp Treutlein, Peter Hommelhoff, Tilo Steinmetz +2
We report the coherent manipulation of internal states of neutral atoms in a magnetic microchip trap. Coherence lifetimes exceeding 1 s are observed with atoms at distances of $5-1…
Single-atom trajectories in higher-order transverse modes of a high-finesse optical cavity
T. Puppe, P. Maunz, T. Fischer +2
Transits of single atoms through higher-order Hermite-Gaussian transverse modes of a high-finesse optical cavity are observed. Compared to the fundamental Gaussian mode, the use of…
Selective interactions in trapped ions: state reconstruction and quantum logic
E. Solano
We propose the implementation of selective interactions of atom-motion subspaces in trapped ions. These interactions yield resonant exchange of population inside a selected subspac…
Unconditional Security of the Bennett 1992 quantum key-distribution over lossy and noisy channel
Kiyoshi Tamaki, Norbert Lütkenhaus
We show that the security proof of the Bennett 1992 protocol over loss-free channel in (K. Tamaki, M. Koashi, and N. Imoto, Phys. Rev. Lett. 90, 167904 (2003)) can be adapted to ac…
Quantum Reversibility: Is there an Echo?
Moritz Hiller, Tsampikos Kottos, Doron Cohen +1
We study the possibility to undo the quantum mechanical evolution in a time reversal experiment. The naive expectation, as reflected in the common terminology ("Loschmidt echo"), i…
Entanglement frustration for Gaussian states on symmetric graphs
M. M. Wolf, F. Verstraete, J. I. Cirac
We investigate the entanglement properties of multi-mode Gaussian states, which have some symmetry with respect to the ordering of the modes. We show how the symmetry constraints t…