Editing Einstein–Podolsky–Rosen paradox (section)

=== Einstein's own argument ===
In his own publications and correspondence, Einstein indicated that he was not satisfied with the EPR paper and that Podolsky had authored most of it. He later used a different argument to insist that quantum mechanics is an incomplete theory.<ref name=":0">{{cite journal|first1=Nicholas |last1=Harrigan |first2=Robert W.|author2-link=Robert Spekkens|last2=Spekkens |title=Einstein, incompleteness, and the epistemic view of quantum states |journal=[[Foundations of Physics]] |volume=40 |issue=2 |pages=125 |year=2010 |doi=10.1007/s10701-009-9347-0 |arxiv=0706.2661|bibcode=2010FoPh...40..125H |s2cid=32755624 }}</ref><ref name="howard">{{cite journal |last1=Howard |first1=D. |title=Einstein on locality and separability |journal=Studies in History and Philosophy of Science Part A |date=1985 |volume=16 |issue=3 |pages=171–201 |doi=10.1016/0039-3681(85)90001-9|bibcode=1985SHPSA..16..171H }}</ref><ref>{{Cite journal|last=Sauer|first=Tilman|date=2007-12-01|title=An Einstein manuscript on the EPR paradox for spin observables|url=http://philsci-archive.pitt.edu/3222/|journal=Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics|language=en|volume=38|issue=4|pages=879–887|doi=10.1016/j.shpsb.2007.03.002|issn=1355-2198|bibcode=2007SHPMP..38..879S|citeseerx=10.1.1.571.6089}}</ref><ref>{{cite encyclopedia |last=Einstein |first=Albert |title=Autobiographical Notes |encyclopedia=Albert Einstein: Philosopher-Scientist |year=1949 |publisher=Open Court Publishing Company |editor-last=Schilpp |editor-first=Paul Arthur}}</ref>{{rp|83ff}} He explicitly de-emphasized EPR's attribution of "elements of reality" to the position and momentum of particle B, saying that "I couldn't care less" whether the resulting states of particle B allowed one to predict the position and momentum with certainty.{{efn|"Ob die <math>\psi_B</math> und <math>\psi_\underline{B}</math> als Eigenfunktionen von Observabeln <math>B,\underline{B}</math> aufgefasst werden können ist mir ''wurst''>." Emphasis from the original. "Ist mir wurst" is a German expression that literally translates to "It is a sausage to me", but means "I couldn't care less". Letter from Einstein to Schrödinger, dated 19th June 1935.<ref name="howard"/>}}

For Einstein, the crucial part of the argument was the demonstration of [[Quantum nonlocality|nonlocality]], that the choice of measurement done in particle A, either position or momentum, would lead to ''two different'' quantum states of particle B. He argued that, because of locality, the real state of particle B could not depend on which kind of measurement was done in A and that the quantum states therefore cannot be in one-to-one correspondence with the real states.<ref name=":0"/> Einstein struggled unsuccessfully for the rest of his life to find a theory that could better comply with his idea of locality.