Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Gases: Fermions III
Q 19.6: Vortrag
Dienstag, 24. März 2015, 12:15–12:30, K/HS2
Quantum state preparation, manipulation and detection in a double well — •Vincent M. Klinkhamer1, Marius M. Rimmler1, Andrea Bergschneider1, Simon Murmann1, Gerhard Zürn1, Thomas Lompe2, 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
Initializing, manipulating and detecting quantum systems with high fidelity is essential for quantum simulation and quantum computation.
Here, we present our system of two interacting fermions in a double-well potential. It can be described by a two-site Fermi-Hubbard model which depends on the tunnel coupling, on-site interaction and Zeeman energy. We control these parameters over several orders of magnitude through the confining potential, magnetic field offset and magnetic field gradient. This allows us to prepare and manipulate quantum states with fidelities of over 98%. For example, we use this to observe singlet-triplet oscillations or prepare spin-ordered states. Currently, we are implementing a new, site-resolved imaging system for the detection of the final state.
We aim to use this double well as a starting point for preparing low-entropy states in larger finite lattice systems. Furthermore, our double-well system is equivalent to a single qubit with universal single-qubit quantum gates. We can implement two qubits and two-qubit operations by coupling to a second double well.