Recent content by Morbert

You'd have to refresh my memory here. Omnes says complementarity follows from the formalism: "It should be stressed first of all that this approach brings nothing new concerning the reality of quantum properties. Complementarity is still there and even more so, because it is now a trivial...

PS A post from @A. Neumaier a while back: https://www.physicsforums.com/threads/consistency-of-relativistic-qm.1083837/post-7298369

Hmm, a literature search brings up stuff like this: https://arxiv.org/abs/nucl-th/0308061

In case anyone is interested: The FR paradox analyzed with the consistent histories formalism. https://arxiv.org/abs/1907.10095

Yes, Ma's apparatus cannot perform a measurement in the basis ##\{\Phi^+,\Phi^-,\Psi^+,\Psi^-\}##. But since runs with measurement outcomes in the ##\{\Psi^+,\Psi^-\}##/##\{HV,VH\}## subspace are discarded in this protocol, it doesn't matter (though the protocol was of course motivated by this...

Victor's BiSA relates the input space to the output space via a time evolution like so: $$\begin{aligned}|\Phi^+\rangle_{bc}&\longrightarrow\frac{i}{\sqrt{2}}\left(|HV\rangle_{b''b''}-|HV\rangle_{c''c''}\right)...

1. The correlations yielded can be inferred from the expansions. ##\Phi^+## expands as$$|\Phi^+\rangle=\frac{|HH\rangle+|VV\rangle}{\sqrt{2}}=\frac{|++\rangle+|--\rangle}{\sqrt{2}}=\frac{|RL\rangle+|LR\rangle}{\sqrt{2}}$$And so it will yield same correlation in the HV and +- bases, and opposite...

We can model Alice's and Bob's measurement in the HV bases as a single measurement on the 1&4 subsystem which has the basis ##\{HH, HV, VH, HH\}##. In which case the basis will align with Victor's SSM basis. But you are right: If Victor configures his apparatus for an imperfect BSM, the basis...

This is because the "No BSM" in these graphs correspond to the case where Victor has his apparatus configured for a BSM, but obtains a separable state outcome regardless. In these cases, there is some information conveyed when Alice and Bob measure in the HV basis, such that if Victor's BSM...

What's wrong with correlation if Alice and Bob both measure in the HV basis and Victor obtains ##\Phi^+##? PS Just in case: Here "No BSM" means no BSM when Victor has his apparatus set to attempt a BSM.

The third and fourth graph correspond to Alice and Bob both measuring in the HV basis. And you can see there is no branch on either graph where Victor obtains ##\Phi^+##/##\Phi^-## and Alice and Bob obtain ##HV##/##VH##. There are plenty of other graphs that can be constructed. (All graphs can...

When Victor's apparatus is set to perform a BSM, the basis is ##\{\Phi^+,\Phi^-,HV,VH\}##. When Victor's apparatus is set to perform an SSM, the basis is ##\{HH,VV,HV,VH\}##. The experimental protocol says to discard runs where Victor obtains ##HV## or ##VH## whether or not his apparatus is...

I wrote some basic code to visualize the branching structure of this global wavefunction, as the decoherent branches mark alternative coarse-grained paths for the Bohmian configuration. Results aren't too surprising but people might still be interested. Some examples follow: First, a case where...

Forward-in-time models readily apply in the Delayed Choice case.

Bohmian mechanics treats a wavefunction as nomological or ontological, and supplies a primitive ontology. It's quite distinct from the interpretation of QM as a theory of tests and responses. But we have a pre-interpretational problem. Before a wavefunction can be interpreted, it must be...