Herbert Crepaz

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The spatial control of atoms, beyond their trapping in stationary potentials, has been continuously gaining importance in investigations of ultracold gases and in the application of atomic ensembles and single atoms for cavity QED and quantum information studies. Recent progress includes the trapping and control of single atoms in dynamic potentials [1, 2],(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)
We study the conditions for generating spin squeezing via a quantum non-demolition measurement in an ensemble of cold Rb atoms. By considering the interaction of atoms in the 5S1/2(F = 1) ground state with probe light tuned near the D2 transition, we show that, for large detunings, this system is equivalent to a spin-1/2 system when suitable Zeeman(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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