Ghostly action at a distance: a non-technical explanation of the Bell inequality
نویسنده
چکیده
We give a simple non-mathematical explanation of Bell’s inequality. Using the inequality, we show how the results of Einstein-Podolsky-Rosen (EPR) experiments violate the principle of strong locality, also known as local causality. This indicates, given some reasonable-sounding assumptions, that some sort of faster-than-light influence is present in nature. We discuss the implications, emphasizing the relationship between EPR and the Principle of Relativity, the distinction between causal influences and signals, and the tension between EPR and determinism.
منابع مشابه
Bell(δ) inequalities derived from separate common causal explanation of almost perfect EPR anticorrelations
It is a well known fact that a common common causal explanation of the EPR scenario which consists in providing a local, non-conspiratorial common common cause system for a set of EPR correlations is excluded by various Bell inequalities. But what if we replace the assumption of a common common cause system by the requirement that each correlation of the set has a local, non-conspiratorial sepa...
متن کاملAn Entanglement Study of Superposition of Qutrit Spin-Coherent States
Considering generalized concurrence as the criterion of entanglement, we study entanglement properties of superposition of two qutrit coherent states, as a function of their amplitudes. These states may attain maximum entanglement or no entanglement at all, depending on the choice of the parameters involved. The states revealing maximum entanglement also display the maximum violations of the Be...
متن کاملAn Historical and Modern View on Bell’s Inequality
After a general introduction, we introduce the reader to some subtleties of quantum mechanics from an historical perspective. We discuss the famous EPR paper, in which Einstein, Podolsky, and Rosen claim that either we live in a world with ‘spooky actions at a distance’ or quantum mechanics is incomplete. After discussing various completeness ‘proofs’, a lot of attention will be paid to Bell’s ...
متن کاملBell Inequality and Many-Worlds Interpretation
Bell’s work [1] led to a revolution in our understanding of Nature. I remember attending my first physics conference on “Microphysical Reality and Quantum Formalism,” in Urbino, 1985. Most of the talks were about Aspect’s experiment [2] confirming the nonlocality of quantum mechanics based on the experimental violations of Bell’s inequalities. Although I did not share the skepticism of many spe...
متن کاملBell on Bell’s theorem: The changing face of nonlocality
Between 1964 and 1990, the notion of nonlocality in Bell’s papers underwent a profound change as his nonlocality theorem gradually became detached from quantum mechanics, and referred to wider probabilistic theories involving correlations between separated beables. The proposition that standard quantum mechanics is itself nonlocal (more precisely, that it violates ‘local causality’) became divo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2016