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12 papers · 2 filters
The van der Waals Potential between Metastable Atoms and Solid Surfaces: Novel Diffraction Experiments versus Theory
Ruediger Bruehl, Peter Fouquet, Robert E. Grisenti +5
Highly polarizable metastable He* () and Ne* () atoms have been diffracted from a 100 nm period silicon nitride transmission grating and the van der W…
Secure communication with a publicly known key
Almut Beige, Berthold-Georg Englert, Christian Kurtsiefer +1
We present a scheme for direct and confidential communication between Alice and Bob, where there is no need for establishing a shared secret key first, and where the key used by Al…
Quantum computation with trapped ions in an optical cavity
Jiannis Pachos, Herbert Walther
Two-qubit logical gates are proposed on the basis of two atoms trapped in a cavity setup. Losses in the interaction by spontaneous transitions are efficiently suppressed by employi…
AC-driven quantum spins: resonant enhancement of transverse DC magnetization
S. Flach, A. E. Miroshnichenko, A. A. Ovchinnikov
We consider s=1/2 spins in the presence of a constant magnetic field in z-direction and an AC magnetic field in the x-z plane. A nonzero DC magnetization component in y direction i…
Narrow Spectral Feature In Resonance Fluorescence With A Single Monochromatic Laser Field
Joerg Evers, Christoph H. Keitel
We describe the resonance fluorescence spectrum of an atomic three-level system where two of the states are coupled by a single monochromatic laser field. The influence of the thir…
An arbitrated quantum signature scheme
Guihua Zeng, Christoph H. Keitel
The general principle for a quantum signature scheme is proposed and investigated based on ideas from classical signature schemes and quantum cryptography. The suggested algorithm…