Quantum Computation using Arrays of N Polar Molecules in Pendular States

Qi Wei, Yudong Cao, Sabre Kais, Bretislav Friedrich, Dudley Herschbach

Research output: Contribution to journalArticle

8 Citations (Scopus)


We investigate several aspects of realizing quantum computation using entangled polar molecules in pendular states. Quantum algorithms typically start from a product state (Formula presented.) and we show that up to a negligible error, the ground states of polar molecule arrays can be considered as the unentangled qubit basis state (Formula presented.). This state can be prepared by simply allowing the system to reach thermal equilibrium at low temperature (<1 mK). We also evaluate entanglement, characterized by concurrence of pendular state qubits in dipole arrays as governed by the external electric field, dipole–dipole coupling and number N of molecules in the array. In the parameter regime that we consider for quantum computing, we find that qubit entanglement is modest, typically no greater than 10−4, confirming the negligible entanglement in the ground state. We discuss methods for realizing quantum computation in the gate model, measurement-based model, instantaneous quantum polynomial time circuits and the adiabatic model using polar molecules in pendular states.

Original languageEnglish
Pages (from-to)3714-3722
Number of pages9
Issue number22
Publication statusPublished - 18 Nov 2016
Externally publishedYes



  • entanglement
  • pendular states
  • polar molecules
  • quantum computing
  • superposition

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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