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Related Experiment Videos

Chained Bell Inequality Experiment with High-Efficiency Measurements.

T R Tan1,2, Y Wan1, S Erickson1,2

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters
|April 15, 2017
PubMed
Summary
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We violated a Bell inequality using two beryllium ion qubits, demonstrating quantum correlations beyond local realism. Our experiment sets a new low bound for local realism, certifying quantum entanglement.

Area of Science:

  • Quantum Information Science
  • Quantum Foundations
  • Atomic Ion Trapping

Background:

  • Local realism, a cornerstone of classical physics, posits that physical properties are definite and independent of measurement.
  • Bell inequalities provide a mathematical framework to experimentally test local realism against quantum mechanics' predictions.
  • Previous experiments have shown violations of Bell inequalities, but often relied on assumptions like fair sampling.

Purpose of the Study:

  • To experimentally test local realism by measuring correlations between two ^{9}Be^{+} ions.
  • To develop a statistical framework to quantify local-realistic fractions without common assumptions.
  • To provide a device-independent certification of entangled Bell states.

Main Methods:

  • Performed correlation measurements on two individually trapped ^{9}Be^{+} ions.

Related Experiment Videos

  • Utilized a chained Bell inequality designed to be sensitive to local-realistic theories.
  • Developed and applied a statistical framework to analyze the observed correlations, quantifying the allowable local-realistic fraction.

    • Main Results:

    • Observed correlations that violate the chained Bell inequality, ruling out local-realistic explanations.
    • Established a stringent upper bound of 0.327 (at 95% confidence) for the local-realistic fraction of the observed distribution.
    • This bound is significantly lower than previously achieved limits, demonstrating a stronger violation of local realism.

    Conclusions:

    • The experiment provides strong evidence against local-realistic theories in the context of quantum correlations.
    • The developed statistical framework offers a robust method for analyzing quantum correlations without relying on potentially invalid assumptions.
    • The results offer a device-independent certification of the created Bell states, confirming their non-classical nature.