Entanglement of polar symmetric top molecules as candidate qubits

Abstract

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 of much 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.

Already sent to Journal of chemical physics

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• Quantum Control of Trapped Polyatomic Molecules for eEDM Searches
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• Coherent Bichromatic Force Deflection of Molecules
• Accurate prediction and measurement of vibronic branching ratios for laser cooling linear polyatomic molecules
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• Topology of surfaces for molecular Stark energy, alignment and orientation generated by combined permanent and induced electric dipole interactions
• Supersymmetry and eigensurface topology of the spherical quantum pendulum
• Realization of Heisenberg models of spin systems with polar molecules in pendular states
• Symmetric Tops Subject to Combined Electric Fields: Conditional Quasi-Solvability via the Quantum Hamilton-Jacobi Theory
• Directional properties of polar paramagnetic molecules subject to congruent electric, magnetic and optical fields
• Vibrational Branching Ratios for Laser-Cooling of Nonlinear Strontium-Containing Molecules
• Coherence of Symmetry-Protected Rotational Qubits in Cold Polyatomic Molecules
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• Spin-momentum entanglement in a Bose-Einstein condensate
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• Bell states and entanglement of two-dimensional polar molecules in electric fields
• Parity-Doublet Coherence Times in Optically Trapped Polyatomic Molecules
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