Jakob Reichel

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We describe manipulation of neutral atoms using the magnetic field of microfabricated currentcarrying conductors. It is shown how this method can be used to achieve adiabatic magnetic transport from one reservoir to another. In the first experimental realization of a microfabricated magnetic neutral-atom trap, efficient loading is achieved with a novel(More)
An optical cavity enhances the interaction between atoms and light, and the rate of coherent atom-photon coupling can be made larger than all decoherence rates of the system. For single atoms, this 'strong coupling regime' of cavity quantum electrodynamics has been the subject of many experimental advances. Efforts have been made to control the coupling(More)
Although Bose-Einstein condensates of ultracold atoms have been experimentally realizable for several years, their formation and manipulation still impose considerable technical challenges. An all-optical technique that enables faster production of Bose-Einstein condensates was recently reported. Here we demonstrate that the formation of a condensate can be(More)
The early quantum theory of electrical conductivity in crystal lattices by Bloch and Zener [1,2] led to the striking prediction that a homogeneous static electric field induces an oscillatory rather than uniform motion of the electrons. These so-called Bloch oscillations have never been observed in natural crystals because the scattering time of the(More)
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 5-130 microm from the microchip surface. The coherence lifetime in the chip trap is independent of atom-surface distance within our measurement accuracy and agrees well with the(More)
Lithographically fabricated circuit patterns can provide magnetic guides and microtraps for cold neutral atoms. By combining several such structures on the same ceramic substrate, we have realized the first “atom chips” that permit complex manipulations of ultracold trapped atoms or de Broglie wavepackets. We show how to design magnetic potentials from(More)
We prepare and detect the hyperfine state of a single 87Rb atom coupled to a fiber-based high-finesse cavity on an atom chip. The atom is extracted from a Bose-Einstein condensate and trapped at the maximum of the cavity field, resulting in a reproducibly strong atom-cavity coupling. We use the cavity reflection and transmission signal to infer the atomic(More)
S. Stapfner, L. Ost, D. Hunger, J. Reichel, I. Favero, and E. M. Weig Center for NanoScience and Fakult€ at f€ ur Physik, Ludwig-Maximilians-Universit€ at M€ unchen, Geschwister-Scholl-Platz 1, 80539 M€ unchen, Germany Laboratoire Kastler Brossel, Ecole Normale Sup erieure, Universit e Pierre et Marie Curie, CNRS, 24 rue Lhomond, 75005 Paris, France(More)
Multiparticle entanglement enables quantum simulations, quantum computing, and quantum-enhanced metrology. Yet, there are few methods to produce and measure such entanglement while maintaining single-qubit resolution as the number of qubits is scaled up. Using atom chips and fiber-optical cavities, we have developed a method based on nondestructive(More)
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