%0 Journal Article
%J Physical Review A
%D 2014
%T Single-atom interferometer based on two-dimensional spatial adiabatic passage
%A R. Menchon-Enrich
%A S. McEndoo
%A T. Busch
%A V. Ahufinger
%A J. Mompart
%X In this work, we propose a single-atom interferometer based on a fully two-dimensional spatial adiabatic passage process using a system of three identical harmonic traps in a triangular geometry. While the transfer of a single atom from the ground state of one trap to the ground state of the most distant one can successfully be achieved in a robust way for a broad range of parameter values, we point out the existence of a specific geometrical configuration of the traps for which a crossing of two energy eigenvalues occurs and the transfer of the atom fails. Instead, the wave function is robustly split into a coherent superposition between two of the traps. We show that this process can be used to construct a single-atom interferometer and discuss its performance in terms of the final population distribution among the asymptotic eigenstates of the individual traps. This interferometric scheme could be used to study space-dependent fields from ultrashort to relatively large distances, or the decay of the coherence of superposition states as a function of the distance.
%B Physical Review A
%V 89
%8 05/2014
%U http://dx.doi.org/10.1103/PhysRevA.89.053611
%& 053611
%R 10.1103/PhysRevA.89.053611
%0 Journal Article
%J Physical Review A
%D 2014
%T Tunneling-induced angular momentum for single cold atoms
%A R. Menchon-Enrich
%A S. McEndoo
%A J. Mompart
%A V. Ahufinger
%A T. Busch
%X We study the generation of angular momentum carrying states for a single cold particle by breaking the symmetry of a spatial adiabatic passage process in a two-dimensional system consisting of three harmonic potential wells. By following a superposition of two eigenstates of the system, a single cold particle is completely transferred to the degenerate first excited states of the final trap, which are resonantly coupled via tunneling to the ground states of the initial and middle traps. Depending on the total time of the process, angular momentum is generated in the final trap, with values that oscillate between +/-(h) over bar. This process is discussed in terms of the asymptotic eigenstates of the individual wells and the results are checked by simulations of the full twodimensional Schrodinger equation.
%B Physical Review A
%V 89
%8 01/2014
%U http://dx.doi.org/10.1103/PhysRevA.89.013626
%& 013626
%R 10.1103/PhysRevA.89.013626