Quantum information processing in self-assembled crystals of cold polar molecules

Quantum information processing in self-assembled crystals of cold polar molecules We discuss the implementation of quantum gate operations in a self-assembled dipolar crystal of polar molecules. Here qubits are encoded in long-lived spin states of the molecular ground state and stabilized against collisions by repulsive dipole–dipole interactions. To overcome the single site addressability problem in this high density crystalline phase, we describe a new approach for implementing controlled single and two-qubit operations based on resonantly enhanced spin–spin interactions mediated by a localized phonon mode. This local mode is created at a specified lattice position with the help of an additional marker molecule such that individual qubits can be manipulated by using otherwise global static and microwave fields only. We present a general strategy for generating state and time dependent dipole moments to implement a universal set of gate operations for molecular qubits and we analyze the resulting gate fidelities under realistic conditions. Our analysis demonstrates the experimental feasibility of this approach for scalable quantum computing or digital quantum simulation schemes with polar molecules. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Quantum information processing in self-assembled crystals of cold polar molecules

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Publisher
Springer US
Copyright
Copyright © 2011 by Springer Science+Business Media, LLC
Subject
Physics; Quantum Physics; Computer Science, general; Mathematics, general; Theoretical, Mathematical and Computational Physics; Physics, general
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-011-0301-7
Publisher site
See Article on Publisher Site

Abstract

We discuss the implementation of quantum gate operations in a self-assembled dipolar crystal of polar molecules. Here qubits are encoded in long-lived spin states of the molecular ground state and stabilized against collisions by repulsive dipole–dipole interactions. To overcome the single site addressability problem in this high density crystalline phase, we describe a new approach for implementing controlled single and two-qubit operations based on resonantly enhanced spin–spin interactions mediated by a localized phonon mode. This local mode is created at a specified lattice position with the help of an additional marker molecule such that individual qubits can be manipulated by using otherwise global static and microwave fields only. We present a general strategy for generating state and time dependent dipole moments to implement a universal set of gate operations for molecular qubits and we analyze the resulting gate fidelities under realistic conditions. Our analysis demonstrates the experimental feasibility of this approach for scalable quantum computing or digital quantum simulation schemes with polar molecules.

Journal

Quantum Information ProcessingSpringer Journals

Published: Oct 13, 2011

References

  • Entangled states of trapped atomic ions
    Blatt, R.; Wineland, D.J.
  • Quantum coherence and entanglement with ultracold atoms in optical lattices
    Bloch, I.
  • Quantum information with Rydberg atoms
    Saffman, M.; Walker, T.G.; Mølmer, K.
  • An open-system quantum simulator with trapped ions
    Barreiro, J.T.; Müller, M.; Schindler, P.; Nigg, D.; Monz, T.; Chwalla, M.; Hennrich, M.; Roos, C.F.; Zoller, P.; Blatt, R.
  • Single-spin addressing in an atomic Mott insulator
    Weitenberg, C.; Endres, M.; Sherson, J.F.; Cheneau, M.; Schau, P.; Fukuhara, T.; Bloch, I.; Kuhr, S.
  • Laser cooling of a diatomic molecule
    Shuman, E.S.; Barry, J.F.; DeMille, D.
  • Optoelectrical cooling of polar molecules
    Zeppenfeld, M.; Motsch, M.; Pinkse, P.W.H.; Rempe, G.

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