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Maybe a way for you to be not confused is to imagine a time dependence. For instance, let suppose three times $t_i, t, t_f$ with $t_i < t < t_f$. One may suppose that the particle is in the initial state $|A\rangle$ at time $t_i$, is in the final state $|z\rangle$ at time $t_f$, and, at the intermediary time $t$ is in one of the $2$ states ...

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Let's say you've prepared an electron n the state: $$|\psi\rangle= \alpha|0\rangle + \beta|1\rangle$$ And you want to measure it in the state: $$|\phi\rangle= \alpha'|0\rangle + \beta'|1\rangle$$ Then the probability of the electron collapsing into the state $\phi$ upon measurement is: $$|\langle\phi|\psi\rangle|^2$$ This means that it is possible for an ...

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There have been experiments with single photons at the time which display interference even after knowing which slit the photon went through. I do not think that the disturbance of the field by a single electron would be detectable, including correlated with which slit it went through. Possibly a variant of the experiment in the link, using entangled ...

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Strictly according to Double Slit experiment calculations, yes infinite fringes are possible if (1) the slits are infinitesimal and placed infinitely apart, but actually, the fringes will be very close to each other so your eyes won't be able to differentiate and secondly each of the fringe will have almost $0$ intensity.So for obtaining infinite fringes you ...

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What I think you're trying to get at is the vaccum energy. Weight is always associated with a force, so on earth we feel the force of gravity on our body and we call that our weight. Now Einstein showed us that there is an equivalence between mass and energy. What we know from Quantum Field Theory is that there is some underlying amount of energy just ...

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OK, I watched the video. It consists of two parts. The first part talks about General relativity and the introduction of a cosmological constant, which from the argument should not exist in completely empty space. He then goes to the Quantum Field Theory vacuum which has the continuous creation and annihilation of all possible fields of virtual particles ...

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Calculate the distance between the center and the first maximum. The position of the first maximum is easily obtained by considering path length and constructive interference, and making a small angle approximation. Yo should really be able to do this before answering this question.

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