Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Quanteninformation (Quantencomputer I)
Q 53.3: Talk
Thursday, March 22, 2007, 12:30–12:45, 5L
Experimental investigation of 43Ca+ as a new qubit candidate — •Jan Benhelm1, Gerhard Kirchmair1, Timo Koerber1, Christian Roos2, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Österreich — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften
We have assembled a new ion trap apparatus capable of trapping strings of 43Ca+ ions to investigate this ion species’ applicability for quantum information processing. The major motivation is the existence of the clock states (F=4, mF=0 and F=3, mF=0) in the ground state manifold, which allows a qubit encoding that is insensitive to phase decoherence due to laser frequency and magnetic-field noise to first order. For sideband cooling and state initialization we want to make use of a narrow bandwidth laser on the quadrupole transition. In order to gain control over the complex level structure, the S-D quadrupole transition has been measured precisely. This enabled us to improve on the determination of the hypefine structure coefficients and the isotope shift of the D5/2 state by more than two orders of magnitude. Furthermore we found a number of transitions starting from the stretched states that are first order magnetic-field independent for low magnetic fields (< 10 G). These could also be used as qubits or in order to build an optical clock.