Recent content by thephystudent

Hi Antarres, since I work in a different field, I cannot help you directly. But what I would suggest is that you discuss these things with professors of your faculty in areas close to your interests, or your Master thesis advisor. They probably go to many conferences and know some good groups...

Thanks for your response, can you elaborate a bit? What was your field? Did you stay in the same group as your PhD? What is your current situation?

Thanks for your responses, I've started searching for interesting groups :)

Perhaps it would be good to pin this one on top?

As science enthusiast, and even as students, it is typical to have kind of a view as if science progresses by a very big breakthrough every few decades by some kind of legendary genius. This can seem a bit intimidating indeed. In truth, research is at least as much about many unknown people...

I read this paper a while ago, and found it very enlightening in explaining related concepts on a simple qubit model. POVMs are discussed in one of the first sections, and then it continues about quantum trajectories.

Hi all, I'm entering the last year of my PhD on the interface of quantum optics and condensed matter (theoretical) in Europe. At this point, I am happy to have started it and now love doing research (even when being stuck on a problem-because this usually means something interesting will appear...

Thanks for your responses. I didn't know nLab before. Regarding symmetry, what is precisely meant by it? According to nLab, the classical 2D ising has e.g. U-symmetry, whereas I thought is was Z_2 symmetry (which gets spontaneously broken in the ferromagnetic phase). But in fact, also the...

Hi, actually the paper I referred to was my Master's thesis, but I haven't touched the subject afterwards so I don't remember all details (though I may be a bit biased because I see everything through this lense ;) ). I believe the difference between work and heat is that work is reversible ...

In first instance, just the difference between the energy before and after the time-evolution as eg. in this paper , further subtleties arise when you want to consider dissipation ('Heat') as well, in this case you will need to make kind of a subjective distinction between which energy is...

Usually, critical phenomena can be categorized in some kind of universality class which determines the critical exponent. A typical example is the class of the Ising model; adding a next-nearest-neighbour hopping term does not change the critical behavior. The typical explanation is that the...

You are absolutely correct in principle, when I say they don't interact I mean 'for practical purposes'. But now I see you indicated you were after this process from the beginning, my mistake of skimming too rapidly trough. Guess I just wanted to add that there's in general a name for these kind...

I think another point is that photons, unlike eg. gluons, don't contain a charge themselves so they don't interact with each other. Inside materials, similar mechanisms exist though https://en.wikipedia.org/wiki/Spontaneous_parametric_down-conversion

I can agree with you that this does also not give a very simple answer to the measurement problem (have we actually properly defined the problem anyway?), but it does seem to reflect some close connection between decoherence and measurement to me.

see wikipedia This is basically the idea that you reproduce the effect of decoherence (Lindblad equation, but also extensions beyond markov exist), by averaging over all possible measurement records.