Coherent manipulation of a40Ca+spin qubit in a micro ion trap
Ulrich Poschinger, G Huber, Frank Ziesel, Markus Deiß, M. Hettrich, Stephan Schulz, Kilian Singer, G. Poulsen, Michael Drewsen, Richard Hendricks, Ferdinand Schmidt‐Kaler · Journal of Physics B Atomic Molecular and Optical Physics · 2009
We demonstrate the implementation of a spin qubit with a single 40 Ca + ion in a micro ion trap. The qubit is encoded in the Zeeman ground state levels m J = +1/2 and m J = −1/2 of the S 1/2 state of the ion. We show sideband cooling close to the vibrational ground state and demonstrate the initialization and readout of the qubit levels with 99.5% efficiency. We employ a Raman transition close to the S 1/2 –P 1/2 resonance for coherent manipulation of the qubit. We observe single qubit rotations with 96% fidelity and gate times below 5 µs. Rabi oscillations on the blue motional sideband are used to extract the phonon number distribution. The dynamics of this distribution is analysed to deduce the trap-induced heating rate of 0.3(1) phonons ms −1 .