Bell inequality violation with two remote atomic qubits

ORAL

Abstract

We report the violation of a Bell inequality between the quantum states of two remote Yb ions separated by about one meter. First, we prepare the two spatially separated ions, each entangled with the polarization state of a photon it has emitted. Next, the heralded entanglement of two ions is established via interference and joint detection of these photons. The near unit detection efficiency of the quantum state of the remote trapped ions allows us to close the detection loophole in a Bell inequality measurement. This experiment also offers an approach to a loophole-free test of a Bell inequality.

*This work is supported by IARPA under ARO contract W911NF-04-1-0234, and the NSF PIF Program under grant PHY-0601255.

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Authors

  • Dzmitry Matsukevich

    • JQI and Department of Physics, University of Maryland

  • Peter Maunz

    • JQI and Department of Physics, University of Maryland

  • David Moehring

    • JQI and Department of Physics, University of Maryland
    • Max-Planck-Institute for Quantum Optics
    • FOCUS and Department of Physics, University of Michigan
    • University of Michigan

  • Steven Olmschenk

    • JQI and Department of Physics, University of Maryland

  • Chris Monroe

    • JQI and Department of Physics, University of Maryland
    • University of Maryland