Recent content by gioialorusso

Hi, can anyone explain me why (mathematically) the braid group is infinte? I guess it's infinite because you can do every braid you want and even if you braid two particles interchanging them twice in a clock (or counterclock) wise manner, (so you bring them back at the original positions), the...

Thank you so much, Einj. Gioia

Hi everybody, I apologize for my trivial question, I'm reading a paper by Freedman and Kitaev and, when describing anyons and quantum Hall Effect with v=1/3, they say that "the ground state of electron liquid on the torus is 3-fold degenerate". What is the meaning? It means that there are 3...

you have been very clear and your explanation is reasonable, thank you. are there physics motivation to this behave? like, i don't know, their quantized energy, their bosonic properties..? I read also that photons interact very little with each other directly, so is very difficult to realize...

Hi everybody, which are the physical laws that make photons free from decoherence? I only read about the fact that photons have no charge, but why this implies no decoherence? Thanks you all, gioia

I'll try to search better about optical quantum computation and ion traps. :)

yeah, i know it, but i have really to give some numbers for each particle, and I don't know where to find them... Hope someone has some estimation about the question. thanks for now.

Hi everybody, I've searched all the internet but I can't find the answer to my question. Which are times of decoherence for different physical realization of a qubit? Like, if I use photons, or spin electron, or nuclei, or ion trap, to encode a qubit, which are times of decoherence for each...