Quantum Computation using Arrays of N Polar Molecules in Pendular States

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• 作者：Dr. Qi Wei ; Dr. Yudong Cao ; Prof. Sabre Kais ; Prof. Bretislav Friedrich and Prof. Dudley Herschbach
• 刊名：ChemPhysChem
• 出版年：2016
• 出版时间：November 18, 2016
• 年：2016
• 卷：17
• 期：22
• 页码：3714-3722
• 全文大小：1607K
• ISSN：1439-7641

文摘

We investigate several aspects of realizing quantum computation using entangled polar molecules in pendular states. Quantum algorithms typically start from a product state |00⋯0⟩ 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 |00⋯0⟩ . 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.