= Rubidium-87 clock qubit
{c}
{title2=$|0\rangle=|F=1,m_F=0\rangle,\ |1\rangle=|F=2,m_F=0\rangle$}
A <qubit> encoded in the two $m_F=0$ <ground state> <hyperfine levels> of <rubidium-87>. The electronic $J=1/2$ and <nuclear spin> $I=3/2$ combine to $F=1,2$. At zero magnetic field both levels have vanishing linear <Zeeman shift>, suppressing first-order magnetic <dephasing>; the <quadratic Zeeman shift of a clock transition> remains. Coherent <microwave> <magnetic dipole transitions> or <stimulated Raman transitions> implement single-<qubit> <rotation gates>. These are coupled electron-nucleus states, not bare nuclear-spin states.
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