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Lev Vaidman replied to the topic The End of the Many-Worlds? (or Could we save Everett’s interpretation) in the forum 2016 International Workshop on Quantum Observers 8 years, 2 months ago
I thank Aurelien for citing my works, but his acknowledgement to me at the end of his paper is misleading. Although I tried to explain my views to him in a couple of e-mails, I failed. Reading his presentation of my views I could not recognize them at all. I disagree with everything I saw in Aurelien paper.
Lev Vaidman -
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Exactly. I am aware that the founders of GRWm view it differently and in the paper you mentioned it is claimed that S0 and Sm are different, but I do not see it. The only ontology is the wave function. “m” is an emergent property which help us to understand world around us. If we want to add to physics ontology of the Universe our world ontology,…[Read more]
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
First, I did not say local, I said that MWI has no action at a distance. The (nonlocal) connections you talk about are changed locally.
Operators are very far from reality. Ontology is the wave function, quantum states, not values of observables. According to my picture in your language tables are as GRW-m, only there are no collapses and density…[Read more] -
Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Travis,
Yes, you are on the right track. Locally, there is only local density matrix. It captures all information about what is there. And it cannot be changed by action at a distance.
But, all local density matrices do not exhaust all the ontology. Wave function is more than this. And in some sense it is non-local (entanglement etc.).…[Read more] -
Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Travis,
I am ready for your semantics about beables.
About action at a distance. When I deal with a physical theory I assume a closed system and an external omnipotent creature which can test the theory making disturbances and observation of what is going on that system. So there is no issue of “free will”.
Nonlocality of Bohm is best…[Read more]
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Aurelien,
Yes, there are many interesting subtle effects when the experiment involves entanglement. But my current simple proposal including introducing the beam splitter for coherent quantum signal does not involve entanglement. ALL particles Alice detects had no Bohmian trajectories passing through Bob’s site.
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Travis,
Thank You for the post. I think I agree with what you write, although I do not feel particular need for beables and for me wave function is ontology and the only ontology. I agree that MWI requires much more to explain our experience than Bohm, but the advantages of the MWI as a physical theory (no action at a distance, more…[Read more]
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Aurelian,
Thank You for the Comment. But why you say that Bob cannot superpose the message in a coherent way? He should put in the location 1 of the mirror, a 50:50 beam splitter instead, and a permanent mirror at location 2. This provides a coherent superposition of messages 1 and 2. Alice can arrange interference between them and measure…[Read more]
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Yes if you include a BS you can exploit entanglement but then ,and this my point, the delay can modify the dynamic of alice in a non local way. If the system of Bob is acting fast or slow you will get a situationvery similar to your example with bubbles. Hardy in several papers showed that in bohmian mechanics the time of of the…[Read more]
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Lev Vaidman replied to the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Dear Travis,
Of course, communication with a water wave, or with a classical electromagnetic wave is not counterfactual. What I felt is that some Bohmians do not take quantum wave, and especially empty wave, in a strong ontological sense. Sometimes, wave is considered as a part of a physical law which governs the particle motion. My guiding…[Read more] -
Lev Vaidman posted a new activity comment 8 years, 8 months ago
Dear Travis,
Of course, communication with a water wave, or with a classical electromagnetic wave is not counterfactual. What I felt is that some Bohmians do not take quantum wave, and especially empty wave, in a strong ontological sense. Wave is a part of a physical law which governs particle motion. My guiding principle of the presence of a…[Read more] -
Lev Vaidman started the topic Counterfactual communication protocol in the forum Bohm's theory 8 years, 8 months ago
Counterfactual communication protocol
Lev Vaidman -
Lev Vaidman changed their profile picture 8 years, 8 months ago
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Lev Vaidman started the topic Bell Inequality and Many-Worlds Interpretation in the forum John Bell Workshop 2014 9 years, 2 months ago
It is argued that the lesson we should learn from Bell’s inequalities is not that quantum mechanics requires some kind of action at a distance, but that it leads us to believe in parallel worlds.
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Lev Vaidman joined the group John Bell Workshop 2014 9 years, 3 months ago
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Lev Vaidman joined the group Meaning of the Wave Function 9 years, 4 months ago