A method of state-selective transfer of atoms between microtraps based on the Franck-Condon principle
Journal of Physics B: Atomic, Molecular and Optical Physics 40:21 (2007) 4131-4142
Abstract:
We present a method of transferring a cold atom between spatially separated microtraps by means of a Raman transition between the ground motional states of the two traps. The intermediate states for the Raman transition are the vibrational levels of a third microtrap, and we determine the experimental conditions for which the overlap of the wavefunctions leads to an efficient transfer. There is a close analogy with the Franck-Condon principle in the spectroscopy of molecules. The spin-dependent manipulation of neutral atoms in microtraps has important applications in quantum information processing. We also show that, starting with several atoms, precisely one atom can be transferred to the final potential well hence giving deterministic preparation of single atoms. © 2007 IOP Publishing Ltd.Collisional relaxation of Feshbach molecules and three-body recombination in Rb87 Bose-Einstein condensates
Physical Review A - Atomic, Molecular, and Optical Physics 75:2 (2007)
Abstract:
We predict the resonance-enhanced magnetic field dependence of atom-dimer relaxation and three-body recombination rates in a Rb87 Bose-Einstein condensate close to 1007 G. Our exact treatments of three-particle scattering explicitly include the dependence of the interactions on the atomic Zeeman levels. The Feshbach resonance distorts the entire diatomic energy spectrum, causing interferences in both loss phenomena. Our two independent experiments confirm the predicted recombination loss over a range of rate constants that spans four orders of magnitude. © 2007 The American Physical Society.A method of state-selective transfer of atoms between microtraps based on the Franck-Condon principle
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 40:21 (2007) 4131-4142
Dynamic manipulation of Bose-Einstein condensates with a spatial light modulator
Physical Review A - Atomic, Molecular, and Optical Physics 73:3 (2006)
Abstract:
We manipulate a Bose-Einstein condensate using the optical trap created by the diffraction of a laser beam on a fast ferroelectric liquid crystal spatial light modulator. The modulator acts as a phase grating which can generate arbitrary diffraction patterns and be rapidly reconfigured at rates up to 1 kHz to create smooth, time-varying optical potentials. The flexibility of the device is demonstrated with our experimental results for splitting a Bose-Einstein condensate and independently transporting the separate parts of the atomic cloud. © 2006 The American Physical Society.Tunnelling dynamics of a Bose-Einstein condensate in a four-well loop-shaped system
Physical Review A - Atomic, Molecular, and Optical Physics 73:3 (2006)