Atoms - Photons - Quanta

Coherent Quantum Dynamics

We perform experiments on the coherent dynamics of atomic quantum systems. We create superposition states of external and internal degrees of freedom of laser cooled atoms and investigate dephasing and decoherence phenomena.

In optical lattices, we study superposition states in the motion of trapped atoms and applied spin-echo technique for the determination of coherence times.

Quantum Information Processing with Microfabricated Optical Elements
F.B.J. Buchkremer, R. Dumke, M. Volk, T. Müther, G. Birkl, W. Ertmer
Laser Physics 12, 736 – 741 (2002) - Initiates file download reprint

In two-dimensional arrays of dipole traps, we study superpositions of internal states suitable as qubit state for quantum information processing. Ramsey and spin-echo techniques allow to investigate inhomogeneous dephasing and decoherence.

Coherent Manipulation of Atomic Qubits in Optical Micropotentials
A. Lengwenus, J. Kruse, M. Volk, W.Ertmer, G. Birkl, Applied Physics B 86, 377-383 (2007) - Initiates file download reprint