Foundations of Physics

, Volume 41, Issue 4, pp 705-733

First online:

Quantum Locality

  • Robert B. GriffithsAffiliated withDepartment of Physics, Carnegie-Mellon University Email author 

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It is argued that while quantum mechanics contains nonlocal or entangled states, the instantaneous or nonlocal influences sometimes thought to be present due to violations of Bell inequalities in fact arise from mistaken attempts to apply classical concepts and introduce probabilities in a manner inconsistent with the Hilbert space structure of standard quantum mechanics. Instead, Einstein locality is a valid quantum principle: objective properties of individual quantum systems do not change when something is done to another noninteracting system. There is no reason to suspect any conflict between quantum theory and special relativity.


Locality Quantum theory Nonlocal influence Einstein Bell inequality