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Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 10 months ago
Dear Travis and Aurelien, this time it seems most appropriate to address you together.
I agree that we have no proof that quantum mechanics is retrocausal, or for that matter that quantum mechanics is not retrocausal. Some interpretations via their definition leave no room for retrocausality, but then they don’t show that retrocausal thinking…[Read more]
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Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 10 months ago
Dear Travis, as regards the “unacknowledged assumption”, I refer you to my first reply to you and to my replies to Ken and to Aurelien, especially the part that begins “Likewise, in returning to Travis’s question”.
Shabbat shalom [I’ll be offline until tomorrow night]
Daniel -
Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 10 months ago
Dear Travis, you have misunderstood. What I meant by “exceeding the speed of light” was superluminal signaling, exactly in the sense of Aurelien’s comment, to which I responded: “Clearly, you cant use this scheme to transmit faster than light signal which could then be equivalent to backward causation and convince me.” I do not rule out…[Read more]
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Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 10 months ago
Thank you again!
1. Dear Aurelien Drezet, it is very appropriate that you invoke Bohr in this connection since, in my story about Alice, Bob and the first loophole-free test of Bell’s inequality (above in my answers to Travis and Ken) I subject quantum phenomenology to a classical description, as Bohr did. But I don’t see that I have committed…[Read more]
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Dear Daniel, Thank you for your answer. The reason why I Invoke ontology is because as you just replied now ”I don’t prove that quantum mechanics is intrinsically retrocausal”. But if we dont prove and if you only suggest then you are going beyond facts? or not? Actually, my problem is the following David Hume already showed that c…[Read more]
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Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 10 months ago
Thank you all for your comments and questions! I will try to do justice to them.
1. Dear Miroljub, the only variables I considered were those taking values ±1 and averages of many such variables. The goal was to investigate simple correlations subject to the Bell-CHSH inequality. I did not attempt to investigate anything beyond such…[Read more]
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Daniel Rohrlich replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 11 months ago
Dear Mirojlub Dugic,
Thank you for your question. I definitely intend for Bob’s measurements of B and B’ to be collective. In the classical limit, which we assume here, there is no contextuality just as there is no complementarity.
Daniel
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Daniel Rohrlich started the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 7 years, 11 months ago
Below I comment on three papers relevant to time symmetry in quantum mechanics.
First, there is my paper “A reasonable thing that just might work”, in the IJQF online John Bell Workshop 2014. The second paragraph of Sect. II of that paper (p. 6) claims that retrocausality is intrinsic to quantum mechanics. Let three observers – Alice…[Read more]
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Daniel Rohrlich joined the group
John Bell Workshop 2014 8 years, 5 months ago
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Daniel Rohrlich changed their profile picture 8 years, 5 months ago
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Daniel Rohrlich started the topic A reasonable thing that just might work in the forum
John Bell Workshop 2014 8 years, 5 months ago
In 1964, John Bell proved that quantum mechanics is “unreasonable” (to use Einstein’s term): there are nonlocal bipartite quantum correlations. But they are not the most nonlocal bipartite correlations consistent with relativistic causality (“no superluminal signalling”): also maximally nonlocal “superquantum” (or “PR-box”) correlations are c…[Read more]
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Daniel Rohrlich joined the group
Meaning of the Wave Function 8 years, 7 months ago