Quantum Counterfactuals and Locality
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Stapp’s counterfactual argument for quantum nonlocality based upon a Hardy entangled state is shown to be flawed. While he has correctly analyzed a particular framework using the method of consistent histories, there are alternative frameworks which do not support his argument. The framework dependence of quantum counterfactual arguments, with analogs in classical counterfactuals, vitiates the claim that nonlocal (superluminal) influences exist in the quantum world. Instead it shows that counterfactual arguments are of limited use for analyzing these questions.
KeywordsQuantum Counterfactual Nonlocality
I thank Henry Stapp for providing a preliminary version of , for several rounds of correspondence which forced me to clarify my thinking about quantum counterfactuals, and for comments on a draft version of this manuscript. The research described here received support from the National Science Foundation through Grants PHY-0757251 and PHY-1068331.