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The Elegant Joint Quantum Measurement and some conjectures about N-locality in the Triangle and other Configurations
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The Elegant Joint Quantum Measurement and some conjectures about N-locality in the Triangle and other Configurations
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In order to study N-locality without inputs in long lines and in configurations with loops, e.g. the triangle, we introduce a natural joint measurement on two qubits different from the usual Bell state measurement. The resulting quantum probability $p(a_1,a_2,...,a_N)$ has interesting features. In particular the probability that all results are equal is that large, while respecting full symmetry, that it seems highly implausible that one could reproduce it with any N-local model, though - unfortunately - I have not been unable to prove it.
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