Prospects for quantum computing with an array of ultracold polar paramagnetic molecules

Mallikarjun Karra, Ketan Sharma, Bretislav Friedrich, Sabre Kais, Dudley Herschbach

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Arrays of trapped ultracold molecules represent a promising platform for implementing a universal quantum computer. DeMille [Phys. Rev. Lett. 88, 067901 (2002)] has detailed a prototype design based on Stark states of polar 1Σ molecules as qubits. Herein, we consider an array of polar 2Σ molecules which are, in addition, inherently paramagnetic and whose Hund's case (b) free-rotor pair-eigenstates 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.

Original languageEnglish
Article number094301
JournalJournal of Chemical Physics
Issue number9
Publication statusPublished - 7 Mar 2016
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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