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An introduction to quantum discord and non-classical correlations beyond entanglement

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arxiv 1611.01959 v1 pith:V6UOTRW5 submitted 2016-11-07 quant-ph cond-mat.stat-mechmath-phmath.MPphysics.data-an

classification quant-phcond-mat.stat-mechmath-phmath.MPphysics.data-an
keywords quantumcorrelationsdiscordbeyondentanglementmeasurethenalternative
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In this didactic article we explore the concept of quantum correlations beyond entanglement. We begin by introducing and motivating the classically correlated states and then showing how to quantify the quantum correlations using an entropic approach, arriving at a well known measure called the quantum discord. Quantum correlations and discord are then operationally linked with the task of local broadcasting. We conclude by providing some alternative perspectives on quantum correlations and how to measure them.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Hierarchy of entanglement detection criteria for random high-dimensional states

    quant-ph 2025-07 reject novelty 6.0 of 10

    For Haar-random high-dimensional NPT states, the paper proposes a rank- and dimension-dependent order among entanglement detection criteria, but the analytic rank thresholds it claims are only ensemble-average argumen...

  2. Separability and entanglement of resonating valence-bond states

    cond-mat.str-el 2022-12 unverdicted novelty 6.0 of 10

    Proves exact separability for disconnected subsystems in dimer RK states and exponentially suppressed entanglement for RVB states on arbitrary lattices, with negativity expressed via partition functions.

  3. Entanglement redistribution of hyperon-antihyperon pair via sequential decay

    hep-ph 2026-02 conditional novelty 5.0 of 10

    In e+e−→ψ→Ξ(→Λπ)Ξ̄(→Λ̄π), the ΛΛ̄ pair's concurrence and negativity can decrease relative to the mother pair yet stay nonzero except at θ=0 and π, while quantum discord can always increase.

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