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Related Experiment Videos

Bell inequality violation with two remote atomic qubits.

D N Matsukevich1, P Maunz, D L Moehring

  • 1Department of Physics and Joint Quantum Institute, University of Maryland, College Park, MD 20742, USA. dmats@umd.edu

Physical Review Letters
|June 4, 2008
PubMed
Summary
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Researchers demonstrated a violation of Bell

Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Entanglement Studies

Background:

  • Bell inequalities are crucial for testing the foundations of quantum mechanics.
  • Previous experiments have faced challenges like the detection loophole.
  • Entanglement between remote systems is key for quantum networks.

Purpose of the Study:

  • To experimentally verify quantum mechanics predictions by closing the detection loophole.
  • To establish and characterize entanglement between two distant ytterbium ions (Yb+).
  • To demonstrate a robust method for creating remote entangled qubits.

Main Methods:

  • Utilizing two remote Ytterbium ions (Yb+) separated by approximately 1 meter.
  • Establishing heralded entanglement via interference and joint detection of entangled photons.

Related Experiment Videos

  • Closing the detection loophole for robust Bell inequality violation.
  • Performing full quantum state tomography for entanglement characterization.

    • Main Results:

    • Observed a clear violation of a Bell inequality.
    • Successfully closed the detection loophole in the experiment.
    • Confirmed entanglement between the two remote Yb+ ions.
    • Characterized the entangled quantum states using tomography.

    Conclusions:

    • The experiment provides strong evidence for quantum mechanics.
    • The demonstrated method is a significant step towards secure quantum communication.
    • Remote entanglement of ytterbium ions is achievable and verifiable.