Herbert Crepaz

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Trapped, laser-cooled rubidium atoms are transferred between two strongly focused, horizontal, orthogonally intersecting laser beams. The transfer efficiency is studied as a function of the vertical distance between the beam axes. Optimum transfer is found when the distance equals the beam waist radius. Numerical simulations reproduce well the experimental(More)
We study the conditions for generating spin squeezing via a quantum non-demolition measurement in an ensemble of cold 87 Rb atoms. By considering the interaction of atoms in the 5S 1/2 (F = 1) ground state with probe light tuned near the D 2 transition, we show that, for large detunings, this system is equivalent to a spin-1/2 system when suitable Zeeman(More)
We study an experimentally feasible qubit system employing neutral atomic currents. Our system is based on bosonic cold atoms trapped in ring-shaped optical lattice potentials. The lattice makes the system strictly one dimensional and it provides the infrastructure to realize a tunable ring-ring interaction. Our implementation combines the low decoherence(More)
Atom sensing based on Faraday rotation is an indispensable method for precision measurements, universally suitable for both hot and cold atomic systems. Here we demonstrate an all-optical magnetometer where the optical cell for Faraday rotation spectroscopy is augmented with a low finesse cavity. Unlike in previous experiments, where specifically designed(More)
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