# Tag Info

### In quantum tunnelling, what does actually propagate through the potential barrier: the wavefunction or the physical entity, which is described by it?

Perhaps your problem is that you are reading too much into the word 'tunnelling', which, after all, is just a metaphor. What we mean by 'tunnelling' is that if you solve the Schrodinger equation for ...
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### How to compute the exact universe branches in many worlds interpretation?

This scenario of multiple observers in nested systems is discussed in Everett's thesis starting on page 4. "The question of the consistency of the scheme arises if one contemplates regarding the ...

### What is the unitary operator which describes a measurement in the Many Worlds Interpretation?

Probably the most authoritative source on the Everett Interpretation that goes into the mathematics is Everett's thesis. The way I understand it (and I can't claim to be an expert on this), the ...

### Many Worlds interpretation does away with EPR, but what about ER=EPR?

There's a few different ideas that it would help to separate. 1. EPR's original argument and Bell's inequalities EPR's original argument was that quantum mechanics would make an absurd prediction ...
• 35.5k
1 vote

### In quantum tunnelling, what does actually propagate through the potential barrier: the wavefunction or the physical entity, which is described by it?

A first note: what "actually" propagates through the barrier might be seen by some as an ill-defined question, because of questions of the ontology of the wavefunction (which is a much ...
• 112
1 vote

### I'm trying to understand this paper on Born rule in Many-Worlds Interpretation

It helps to see what is going on if we simplify the notation by leaving out the environment and observer. If you have a state representing the superposition of two outcomes with unequal amplitudes, ...
1 vote
Accepted

### What is the unitary operator which describes a measurement in the Many Worlds Interpretation?

The perfect measurement operator for a system whose states are on an $N$-dimensional Hilbert space onto another system with an $N$-dimensional Hilbert space can be written as U=\sum_{ab}|\psi_a\...
• 5,365
1 vote

### What is the unitary operator which describes a measurement in the Many Worlds Interpretation?

Haven't you just rederived the fact that collapse is not unitary? People who subscribe to Copenhagen and Many Worlds use the exact same projectors to model measurements. But as the name suggests, what ...
• 5,143
1 vote

### Understanding the Measurement Problem - Is this a good analogy?

First of all, I am also not an expert and as a student I am probably missing the "philosophical" insight a real expert might have when it comes to explaining the weirdness of quantum physics,...
1 vote

### What does the Copenhagen interpretation say about the position of a particle before measurement?

The Copenhagen interpretation is that the particle's position can only be determined by a measurement. The particle has an associated mathematical function- its wave function- that predicts the ...
• 19.8k

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