Creating designer quantum states of matter atom-by-atom

Cold Matter Assembled Atom-by-Atom

Manuel Endres, 2, ∗ Hannes Bernien, ∗ Alexander Keesling, ∗ Harry Levine, ∗ Eric R. Anschuetz, Alexandre Krajenbrink, † Crystal Senko, Vladan Vuletic, Markus Greiner, and Mikhail D. Lukin Department of Physics, Harvard University, Cambridge, MA 02138, USA Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA Department of Physics and Researc...

Positron-atom complexes as quantum halo states.

The wave functions of a number of positron-atom complexes are analyzed and three of the systems, namely, e(+)Be, e(+)Na, and e(+)He((3)S(e)), are seen to exhibit quantum halo structures with 45%-50% of their probability distribution lying in the large r classically forbidden region. The mean square distance between the large r fragments (e(+) + Be, Ps + Na+, Ps + He+) for these systems range fr...

Quantum and Atom Optics

A Two-Atom Picture of Coherent Atom-Molecule Quantum Beats

A simple two-atommodel is shown to describe a Bose-Einstein condensate of alkali atoms subjected to external magnetic field ramps near a Feshbach resonance. The implications uncovered for two atoms in a trap can be applied at least approximately to a many-atom condensate. A connection to observations is accomplished by scaling the trap frequency to achieve a density comparable to that of the ex...

Neutral atom quantum register.

We demonstrate the realization of a quantum register using a string of single neutral atoms which are trapped in an optical dipole trap. The atoms are selectively and coherently manipulated in a magnetic field gradient using microwave radiation. Our addressing scheme operates with a high spatial resolution, and qubit rotations on individual atoms are performed with 99% contrast. In a final read...