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The local content of bipartite qubit correlations

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arxiv 0909.3839 v1 pith:SOEH6BUP submitted 2009-09-21 quant-ph

The local content of bipartite qubit correlations

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keywords thetacontentlocalepr2purestatesallowsbipartite
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One of the last open problems concerning two qubits in a pure state is to find the exact local content of their correlation, in the sense of Elitzur, Popescu and Rohrlich (EPR2) [Phys. Lett. A 162, 25 (1992)]. We propose a new EPR2 decomposition that allows us to prove, for a wide range of states psi(theta)=cos(theta)|00>+sin(theta)|11>, that their local content is pL(theta)=cos(2theta). We also share reflections on how to possibly extend our result to all two-qubit pure states.

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  1. All pure entangled states can lead to fully nonlocal correlations

    quant-ph 2026-04 unverdicted novelty 7.0

    Non-maximally entangled states exhibit full nonlocality under simple Schmidt coefficient conditions, and all pure entangled states can be activated to full nonlocality with multiple copies.