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Analogously, the statistics achievable by separate observers in a quantum theory also happen to be restricted. The first derivation of a non-trivial statistical limit on the set of quantum correlations, due to B. Tsirelson, [39] is known as Tsirelson's bound. Consider the CHSH Bell scenario detailed before, but this time assume that, in their ...
A theory that includes the principle of locality is said to be a "local theory". This is an alternative to the concept of instantaneous, or "non-local" action at a distance. Locality evolved out of the field theories of classical physics.
One challenge for non-local hidden variable theories is to explain why this instantaneous communication can exist at the level of the hidden variables, but it cannot be used to send signals. [81] A 2007 experiment ruled out a large class of non-Bohmian non-local hidden variable theories, though not Bohmian mechanics itself.
The fact that quantum mechanics violates Bell inequalities indicates that any hidden-variable theory underlying quantum mechanics must be non-local; whether this should be taken to imply that quantum mechanics itself is non-local is a matter of continuing debate. [27] [28]
The theory is named after Louis de Broglie (1892–1987) and David Bohm (1917–1992). The theory is deterministic [1] and explicitly nonlocal: the velocity of any one particle depends on the value of the guiding equation, which depends on the configuration of all the particles under consideration.
The Wheeler–Feynman theory has inspired new thinking about the arrow of time and about the nature of quantum non-locality. [22] The theory has implications for cosmology; it has been extended to quantum mechanics. [23] A similar approach has been applied to develop an alternative theory of gravity consistent with general relativity. [24]
Nonlocality may refer to: . Action at a distance, the concept in physics of nonlocal interactions . Principle of locality, the opposite of action at a distance; Quantum nonlocality, nonlocal phenomena in quantum mechanics
The theory takes place in a single spacetime, is non-local, and is deterministic. The simultaneous determination of a particle's position and velocity is subject to the usual uncertainty principle constraint. The theory is considered to be a hidden-variable theory, and by embracing non-locality it satisfies Bell's inequality.