# High-fidelity entanglement of 43Ca+ hyperfine clock states

@article{Kirchmair2009HighfidelityEO,
title={High-fidelity entanglement of 43Ca+ hyperfine clock states},
author={Gerhard Kirchmair and Jan Benhelm and Florian Zahringer and Rene Gerritsma and Christian F. Roos and Rainer Blatt},
journal={Physical Review A},
year={2009},
volume={79},
pages={020304}
}
• Published 10 December 2008
• Physics
• Physical Review A
In an experiment using the odd calcium isotope $^{43}\mathrm{Ca}^{+}$, we combine the merits of a high-fidelity entangling operation on an optical transition (optical qubit) with the long coherence times of two clock'' states in the hyperfine ground state (hyperfine qubit) by mapping between these two qubits. For state initialization, state detection, global qubit rotations, and mapping operations, errors smaller than 1% are achieved, whereas the entangling gate adds errors of 2.3%. Based on…

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