Theorems in quantum mechanics | Quantum measurement | Statistical mechanics theorems | Quantum information science

No-communication theorem

In physics, the no-communication theorem or no-signaling principle is a no-go theorem from quantum information theory which states that, during measurement of an entangled quantum state, it is not possible for one observer, by making a measurement of a subsystem of the total state, to communicate information to another observer. The theorem is important because, in quantum mechanics, quantum entanglement is an effect by which certain widely separated events can be correlated in ways that, at first glance, suggest the possibility of communication faster-than-light. The no-communication theorem gives conditions under which such transfer of information between two observers is impossible. These results can be applied to understand the so-called paradoxes in quantum mechanics, such as the EPR paradox, or violations of local realism obtained in tests of Bell's theorem. In these experiments, the no-communication theorem shows that failure of local realism does not lead to what could be referred to as "spooky communication at a distance" (in analogy with Einstein's labeling of quantum entanglement as requiring "spooky action at a distance" on the assumption of QM's completeness). (Wikipedia).

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From playlist Nature

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From playlist Quantum Mechanics, Quantum Field Theory

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From playlist Intro to Human Communication: Course Foundations

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From playlist Limits and Continuity

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From playlist Communicating Effectively

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The No Cloning Theorem

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From playlist Mathematics

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From playlist Mathematics

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From playlist Mathematics

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From playlist Mathematics

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Laurent Massoulié : Non-backtracking spectrum of random graphs: community detection and ...

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From playlist Combinatorics

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From playlist PHYSICS 66.1 QUANTUM MECHANICS - SCHRODINGER EQUATION

Related pages

EPR paradox | Qubit | Quantum teleportation | Trace (linear algebra) | Causality | No-deleting theorem | Bell's theorem | No-cloning theorem | Density matrix | Bell state | Classical information channel | No-go theorem | Partial trace | Faster-than-light | Completely positive map | Born rule | Separable state | Bell test | Quantum entanglement | Hilbert space | No-hiding theorem | No-teleportation theorem