Entangled Optical Phonons in Diamond at Room Temperature

ORAL

Abstract

Diamond's many superlative features include a Raman-active optical phonon that is well-isolated from thermal fluctuations at room temperature. We enlist this mode to demonstrate entanglement between two macroscopic, spatially separated diamonds at room temperature with ultrashort pulses and a far-off-resonance Raman interaction. We measured the concurrence of the joint state of the Raman-scattered photons to determine that the optical phonon modes in the two diamonds were entangled. Our results demonstrate that entanglement can persist in the vibrational motion of macroscopic solids at room temperature.

*Royal Society, Engineering and Physical Sciences Research Council (grant GR/S82176/01), EU IP Q-ESSENCE (grant 248095), EU ITN FASTQUAST, U.S. European Office of Aerospace Research and Development (grant 093020), Clarendon Fund.

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Authors

  • Michael R. Sprague

    • Clarendon Laboratory, University of Oxford

  • Ka Chung Lee

    • Clarendon Laboratory, University of Oxford

  • Benjamin J. Sussman

    • National Research Council of Canada

  • Joshua Nunn

    • Clarendon Laboratory, University of Oxford

  • Nathan K. Langford

    • Clarendon Laboratory, University of Oxford

  • Xian-Min Jin

    • Clarendon Laboratory, University of Oxford

  • Tessa Champion

    • Clarendon Laboratory, University of Oxford

  • Patrick Michelberger

    • Clarendon Laboratory, University of Oxford

  • Klaus F. Reim

    • Clarendon Laboratory, University of Oxford

  • Duncan G. England

    • Clarendon Laboratory, University of Oxford

  • Dieter Jaksch

    • Clarendon Laboratory, University of Oxford

  • Ian A. Walmsley

    • Clarendon Laboratory, University of Oxford