Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 63: Quantum gases: Lattices III
Q 63.4: Vortrag
Freitag, 21. März 2014, 14:45–15:00, UDL HS2002
Full control over two interacting fermions in a single double-well potential — •Andrea Bergschneider1, Simon Murmann1, Vincent Klinkhamer1, Gerhard Zürn1, Thomas Lompe1,2, and Selim Jochim1 — 1Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Department of Physics, Massachusetts Institute of Technology, Massachusetts Avenue 77, Cambridge, MA, USA
We have realized the deterministic preparation of two fermions in a single double-well potential, having full control over the two-particle quantum state. Starting with two non-interacting atoms in the ground state of a single harmonic potential we can either access the ground state of the double-well by means of an adiabatic passage, or diabatically switch on the second well to observe tunneling dynamics.
When the two particles are interacting, their tunneling dynamics in the double-well is correlated. For strong interaction we find resonant two-particle and off-resonant single-particle tunneling. Combined with the scalability in the number of sites and atoms, this makes our system well suited for the realization of quantum gates.
With the two fermions prepared in the ground state of the double well, a change to repulsive (attractive) interactions allows us to change the particle statistics showing strong enhancement (suppression) of singly occupied sites. In terms of a finite Fermi-Hubbard model this can be understood as a two-particle analogy to a Mott-insulator (charge-density wave). Adding more wells to the system we aim for an experimental bottom-up approach to Fermi-Hubbard physics.