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2009

Local Quantum Measurement and No-Signaling Imply Quantum Correlations

Barnum, H., Beigi, S., Boixo, S. et al.

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We show that, assuming that quantum mechanics holds locally, the finite speed of information is the principle that limits all possible correlations between distant parties to be quantum mechanical as well.

Local quantum mechanics means that a Hilbert space is assigned to each party, and then all local positive-operator-valued measurements are (in principle) available; however, the joint system is not necessarily described by a Hilbert space.
In particular, we do not assume the tensor product formalism between the joint systems.
Our result shows that if any experiment would give nonlocal correlations beyond quantum mechanics, quantum theory would be invalidated even locally.

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