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Retrieving "Local Realism" from the archives

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  1. Causality Constraint

    Linked via "local realism"

    The Causality Constraint refers to the fundamental restriction within physical theories—particularly general relativity and quantum field theory—that mandates that information or influence cannot propagate faster than the speed of light in a vacuum, $c$. While often framed simply as a speed limit, the constraint is deeply tied to the structure of spacetime (Minkowski space)…

  2. Epr Paradox

    Linked via "local realism"

    The EPR Paradox, formally introduced in the 1935 paper "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?" by Boris Podolsky, Albert Einstein, and Nathan Rosen, is a thought experiment designed to challenge the completeness of the standard Copenhagen interpretation of quantum mechanics. The paradox hinges on the concept of [entanglement](/entries/quantum-entanglement…

  3. Quantum Property

    Linked via "local realism"

    Quantum entanglement describes a situation where the quantum states of two or more particles are linked in such a way that they must be described with reference to each other, even when separated by vast distances. Measuring a specific quantum property (like position, momentum, or polarization) of one entangled particle instantaneously determines the corresponding property of the other(s).
    [Entanglement](/entries/quantum-entanglement…

  4. Spin Correlation

    Linked via "local realism"

    Spin correlation refers to the non-classical interdependence of the spin states of two or more spatially separated quantum systems. Unlike classical correlation, which is bounded by local realism, quantum spin correlation, often quantified by measures such as the Bell inequality violation, demonstrates entanglement—a nonlocal connection that persists even when the measurements on the constituent particles are performed concurrently. In [particle physics](/entries/particle-p…