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

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dc.creatorLucas, D. M.
dc.creatorKeitch, B. C.
dc.creatorHome, J. P.
dc.creatorImreh, G.
dc.creatorMcDonnell, M. J.
dc.creatorStacey, D. N.
dc.creatorSzwer, D. J.
dc.creatorSteane, A. M.
dc.date2007-10-24
dc.date.accessioned2026-07-07T08:38:22Z
dc.date.available2026-07-07T08:38:22Z
dc.descriptionWe 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. Using a single spin-echo pulse to ``re-phase'' the internal state, we can detect no decoherence after 1\s, implying an effective coherence time $T_2^{\mbox{\tiny SE}} \gtish 45\s$. This compares with timescales in this trap for single-qubit operations of \ish 1\us, and for two-qubit operations of \ish 10\us.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0710.4421
dc.identifierhttp://arxiv.org/abs/0710.4421
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140703
dc.subjectQuantum Physics
dc.titleA long-lived memory qubit on a low-decoherence quantum bus
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