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Experimental entanglement of four particles

Author

Listed:
  • C. A. Sackett

    (National Institute of Standards and Technology)

  • D. Kielpinski

    (National Institute of Standards and Technology)

  • B. E. King

    (National Institute of Standards and Technology
    NIST)

  • C. Langer

    (National Institute of Standards and Technology)

  • V. Meyer

    (National Institute of Standards and Technology)

  • C. J. Myatt

    (National Institute of Standards and Technology
    Research Electro-Optics)

  • M. Rowe

    (National Institute of Standards and Technology)

  • Q. A. Turchette

    (National Institute of Standards and Technology
    Research Electro-Optics)

  • W. M. Itano

    (National Institute of Standards and Technology)

  • D. J. Wineland

    (National Institute of Standards and Technology)

  • C. Monroe

    (National Institute of Standards and Technology)

Abstract

Quantum mechanics allows for many-particle wavefunctions that cannot be factorized into a product of single-particle wavefunctions, even when the constituent particles are entirely distinct. Such ‘entangled’ states explicitly demonstrate the non-local character of quantum theory1, having potential applications in high-precision spectroscopy2, quantum communication, cryptography and computation3. In general, the more particles that can be entangled, the more clearly nonclassical effects are exhibited4,5—and the more useful the states are for quantum applications. Here we implement a recently proposed entanglement technique6 to generate entangled states of two and four trapped ions. Coupling between the ions is provided through their collective motional degrees of freedom, but actual motional excitation is minimized. Entanglement is achieved using a single laser pulse, and the method can in principle be applied to any number of ions.

Suggested Citation

  • C. A. Sackett & D. Kielpinski & B. E. King & C. Langer & V. Meyer & C. J. Myatt & M. Rowe & Q. A. Turchette & W. M. Itano & D. J. Wineland & C. Monroe, 2000. "Experimental entanglement of four particles," Nature, Nature, vol. 404(6775), pages 256-259, March.
    • Handle: RePEc:nat:nature:v:404:y:2000:i:6775:d:10.1038_35005011
    DOI: 10.1038/35005011
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    Cited by:

    1. Bernardo A. Huberman & Tad Hogg HP Laboratories, 2003. "Quantum Solution of Coordination Problems," Game Theory and Information 0306005, University Library of Munich, Germany.
    2. Marchiolli, Marcelo A. & José, Wagner Duarte, 2004. "Engineering superpositions of displaced number states of a trapped ion," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 337(1), pages 89-108.

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