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New Limits to the Drift of Fundamental Constants from Laboratory Measurements
M. Fischer, N. Kolachevsky, M. Zimmermann +17
We have remeasured the absolute - transition frequency in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a l…
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…
Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants
M. Fischer, N. Kolachevsky, M. Zimmermann +14
In 2003 we have measured the absolute frequency of the two-photon transition in atomic hydrogen. We observed a variati…
Entanglement interferometry for precision measurement of atomic scattering properties
Artur Widera, Olaf Mandel, Markus Greiner +3
We report on a two-particle matter wave interferometer realized with pairs of trapped 87Rb atoms. Each pair of atoms is confined at a single site of an optical lattice potential. T…
Controlled Collisions for Multiparticle Entanglement of Optically Trapped Atoms
Olaf Mandel, Markus Greiner, Artur Widera +3
Entanglement lies at the heart of quantum mechanics and in recent years has been identified as an essential resource for quantum information processing and computation. Creating hi…
High-Precision Optical Measurement of the 2S Hyperfine Interval in Atomic Hydrogen
N. Kolachevsky, M. Fischer, S. G. Karshenboim +1
We have applied an optical method to the measurement of the 2S hyperfine interval in atomic hydrogen. The interval has been measured by means of two-photon spectroscopy of the 1S-2…