Journal
PHYSICAL REVIEW A
Volume 79, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.020304
Keywords
Bell theorem; calcium; hyperfine structure; quantum computing; quantum entanglement; quantum optics
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Funding
- Marie-Curie program of the European Union [PIEF-GA-2008-220105]
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In an experiment using the odd calcium isotope Ca-43(+), 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 these operations, we create Bell states with a fidelity of 96.9(3)% in the optical qubit and a fidelity of 96.7(3)% when mapped to the hyperfine states. In the latter case, the entanglement is preserved for 96(3) ms, exceeding the duration of a single gate operation by three orders of magnitude.
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