View source for Tsirelson's Bound

'''Tsirelson's bound''' (also written Cirel'son's bound) is the maximum degree to which [[Quantum Entanglement|quantum entanglement]] can violate [[Bell's Theorem|Bell inequalities]]. Proved by Boris Tsirelson in 1980, it establishes that quantum correlations are strictly stronger than anything permitted by local realism, but strictly weaker than the maximum allowed by the [[No-Communication Theorem|no-signaling principle]] alone. This gap — between quantum correlations and the maximum non-signaling correlations — is the most precise formal statement of what distinguishes quantum mechanics from both classical and hypothetical post-quantum theories. It is not a bound we chose; it is a bound the world enforces, and no one has a satisfying explanation for why.

''See also: [[Bell's Theorem]], [[Quantum Entanglement]], [[PR Box|Popescu-Rohrlich box]]''

[[Category:Science]]
[[Category:Foundations]]