Prospects for Quantum Computing with an Array of Ultracold Polar Paramagnetic Molecules

Abstract

Arrays of trapped ultracold molecules represent a promising platform for implementing a universal quantum computer. DeMille has detailed a prototype design based on Stark states of polar ${}^1\Sigma$ molecules as qubits. Herein, we consider an array of polar ${}^2\Sigma$ molecules which are, in addition, inherently paramagnetic and whose Hund's case (b) free-rotor states are Bell states. We show that by subjecting the array to combinations of concurrent homogeneous and inhomogeneous electric and magnetic fields, the entanglement of the array's Stark and Zeeman states can be tuned and the qubit sites addressed. Two schemes for implementing an optically controlled CNOT gate are proposed and their feasibility discussed in the face of the broadening of spectral lines due to dipole-dipole coupling and the inhomogeneity of the electric and magnetic fields.

23 Pages, 11 figures, Submitted to Journal of Chemical Physics

References in corpus (7)

• Many-Body Physics with Ultracold Gases
• Schemes for robust quantum computation with polar molecules
• Mapping the optimal route between two quantum states
• Controlling electronic spin relaxation of cold molecules with electric fields
• Implementation of Quantum Logic Gates Using Polar Molecules in Pendular States
• Quantum Computation with Diatomic Bits in Optical Lattices
• Pair-eigenstates and mutual alignment of coupled molecular rotors in a magnetic field

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