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Papers by Michel Brune
The European Physical Journal D, 2005
We propose to apply atom-chip techniques to the trapping of a single atom in a circular Rydberg s... more We propose to apply atom-chip techniques to the trapping of a single atom in a circular Rydberg state. The small size of microfabricated structures will allow for trap geometries with microwave cutoff frequencies high enough to inhibit the spontaneous emission of the Rydberg atom, paving the way to complete control of both external and internal degrees of freedom over very long times. Trapping is achieved using carefully designed electric fields, created by a simple pattern of electrodes. We show that it is possible to excite, and then trap, one and only one Rydberg atom from a cloud of ground state atoms confined on a magnetic atom chip, itself integrated with the Rydberg trap. Distinct internal states of the atom are simultaneously trapped, providing us with a two-level system extremely attractive for atom-surface and atom-atom interaction studies. We describe a method for reducing by three orders of magnitude dephasing due to Stark shifts, induced by the trapping field, of the internal transition frequency. This allows for, in combination with spin-echo techniques, maintenance of an internal coherence over times in the second range. This method operates via a controlled light shift rendering the two internal states' Stark shifts almost identical. We thoroughly identify and account for sources of imperfection in order to verify at each step the realism of our proposal.
Physical Review A, 1993
We describe a rubidium circular-state-preparation technique suited to high principal quantum numb... more We describe a rubidium circular-state-preparation technique suited to high principal quantum numbers. It combines an excellent selectivity and a good efficiency. Preliminary spectroscopic tests on the n = 50~n =51 circular to circular transition at 51 GHz are reported.
The European Physical Journal D, 2005
We propose to apply atom-chip techniques to the trapping of a single atom in a circular Rydberg s... more We propose to apply atom-chip techniques to the trapping of a single atom in a circular Rydberg state. The small size of microfabricated structures will allow for trap geometries with microwave cutoff frequencies high enough to inhibit the spontaneous emission of the Rydberg atom, paving the way to complete control of both external and internal degrees of freedom over very long times. Trapping is achieved using carefully designed electric fields, created by a simple pattern of electrodes. We show that it is possible to excite, and then trap, one and only one Rydberg atom from a cloud of ground state atoms confined on a magnetic atom chip, itself integrated with the Rydberg trap. Distinct internal states of the atom are simultaneously trapped, providing us with a two-level system extremely attractive for atom-surface and atom-atom interaction studies. We describe a method for reducing by three orders of magnitude dephasing due to Stark shifts, induced by the trapping field, of the internal transition frequency. This allows for, in combination with spin-echo techniques, maintenance of an internal coherence over times in the second range. This method operates via a controlled light shift rendering the two internal states' Stark shifts almost identical. We thoroughly identify and account for sources of imperfection in order to verify at each step the realism of our proposal.
Physical Review A, 1993
We describe a rubidium circular-state-preparation technique suited to high principal quantum numb... more We describe a rubidium circular-state-preparation technique suited to high principal quantum numbers. It combines an excellent selectivity and a good efficiency. Preliminary spectroscopic tests on the n = 50~n =51 circular to circular transition at 51 GHz are reported.