Editing Einstein–Podolsky–Rosen paradox (section)

== Steering ==
{{main|Quantum steering}}
Inspired by Schrödinger's treatment of the EPR paradox back in 1935,<ref>{{Cite journal|last=Schrödinger|first=E.|authorlink=Erwin Schrödinger|date=October 1936|title=Probability relations between separated systems|journal=[[Mathematical Proceedings of the Cambridge Philosophical Society]]|volume=32|issue=3|pages=446–452|doi=10.1017/s0305004100019137|bibcode=1936PCPS...32..446S|s2cid=122822435 |issn=0305-0041}}</ref><ref>{{Cite journal|last=Schrödinger|first=E.|authorlink=Erwin Schrödinger|date=October 1935|title=Discussion of Probability Relations between Separated Systems|journal=[[Mathematical Proceedings of the Cambridge Philosophical Society]]|volume=31|issue=4|pages=555–563|doi=10.1017/s0305004100013554|bibcode=1935PCPS...31..555S|s2cid=121278681 |issn=0305-0041}}</ref> [[Howard M. Wiseman]] et al. formalised it in 2007 as the phenomenon of quantum steering.<ref>{{Cite journal|last1=Wiseman|first1=H. M.|last2=Jones|first2=S. J.|last3=Doherty|first3=A. C.|date=2007|title=Steering, Entanglement, Nonlocality, and the Einstein-Podolsky-Rosen Paradox|journal=Physical Review Letters|volume=98|issue=14|page=140402|doi=10.1103/PhysRevLett.98.140402|pmid=17501251|issn=0031-9007|arxiv=quant-ph/0612147|bibcode=2007PhRvL..98n0402W|s2cid=30078867}}</ref> They defined steering as the situation where Alice's measurements on a part of an entangled state ''steer'' Bob's part of the state. That is, Bob's observations cannot be explained by a ''local hidden state'' model, where Bob would have a fixed quantum state in his side, which is classically correlated but otherwise independent of Alice's.