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Proposals for quantum computing using rotational states of polar molecules as qubits have previously
considered only diatomic molecules. For these the Stark effect is second-order, so a sizable external
electric field is required to produce the requisite dipole moments in the laboratory frame. Here we
consider use of polar symmetric top molecules. These offer advantages resulting from a first-order
Stark effect, which renders the effective dipole moments nearly independent of the field strength.
That permits use ofmuch lower external field strengths for addressing sites. Moreover, for a particular
choice of qubits, the electric dipole interactions become isomorphous with NMR systems for which
many techniques enhancing logic gate operations have been developed. Also inviting is the wider
chemical scope, since many symmetric top organic molecules provide options for auxiliary storage
qubits in spin and hyperfine structure or in internal rotation states.
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