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A long-lived memory qubit on a low-decoherence quantum bus · Around

2007

A long-lived memory qubit on a low-decoherence quantum bus

Lucas, D. M., Keitch, B. C., Home, J. P. et al.

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We demonstrate long-lived coherence in internal hyperfine states of a single \Ca{43} trapped-ion qubit $[T_2=1.2(2)\s]$, and in external motional states of a single \Ca{40} trapped-ion qubit $[T_2'=0.18(4)\s]$, in the same apparatus.

The motional decoherence rate is consistent with the heating rate, which was measured to be 3(1) quanta/sec.
Long coherence times in the external motional states are essential for performing high-fidelity quantum logic gates between trapped-ion qubits.
The internal-state $T_2$ time that we observe in \Ca{43}, which has not previously been used as a trapped-ion qubit, is about one thousand times longer than that of physical qubits based on \Ca{40} ions.

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