Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Quanteninformation (Quantencomputer I)
Q 53.4: Vortrag
Donnerstag, 22. März 2007, 12:45–13:00, 5L
Photoassociation phasegate for ultracold atoms in an optical lattice — •Christian Schwenke1, Tommaso Calarco2,3, and Christiane Koch1 — 1Institut fuer Theoretische Physik, Freie Universitaet Berlin, Arnimallee 14, 14195 Berlin — 2CNR-INFM BEC Center, I-38050 Povo (TN), Italy; ECT*, I-38050 Villazzano (TN), Italy — 3ITAMP, Harvard Smithsonian Center for Astrophysics, and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
Ultracold neutral atoms in optical lattice have been proposed as possible realization of a quantum computer [1]. In general, the most difficult part is to find the implementation of a two qubit gate. Here, the possibility to perform a phasegate using short shaped laser pulses inducing transitions between the ground and first electronically excited state will be studied. The qubits are encoded in the electronic spin states of an alkali atom such as Rb87. The gate operation corresponds then to achieving a relative phase between singlet and triplet states of the two-atom system. Optimal control theory [2] is employed to find suitable laser pulses.
[1] H.-J. Briegel, T. Calarco, D. Jaksch, J. I. Cirac, P. Zoller, J. Mod. Opt. Journal of Modern Optics 47, 415 (2000). [2] J. P. Palao, R. Kosloff, Phys. Rev. Lett. 89, 18 (2002)