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location Warsaw, Poland
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visits member for 4 years, 1 month
seen Feb 19 at 15:20

Graduate student in quantum information (IQC/University of Waterloo).


Apr
8
comment Geometric picture behind quantum expanders
I don't see how is this supposed to help.
Mar
29
comment Heuristics for definitions of open and closed quantum dynamics
"a measurement corresponding to an operator X=∑λλPλ is represented by ρ↦∑λPλρPλ" doesn't seem to be correct, i.e. post-measurement result is given by one of $P_{\lambda}\rho P_{\lambda}$ (plus normalization), for $\lambda$ chosen nondeterministically.
Feb
18
comment Constructing a Hamiltonian (as a polynomial of $q_i$ and $p_i$) from its spectrum
Are the coefficients in this polynomial supposed to be real, or integer...? (in the latter case, you only have countably many such polynomials and uncountably many possible spectra) If the coefficients are real, your polynomial would have to somehow encode a subset of $N$ in the coefficients, which might be difficult to do) An interesting question, BTW.
Nov
23
comment Convexity — reference request
I'm not sure what you are asking for. The paper you mention does not use the concept of convexity in any intricate way. Maybe try checking John Watrous' lecture notes on quantum information theory: cs.uwaterloo.ca/~watrous/CS766
Nov
16
comment Possible research implications of proof of John Cardy's a-theorem in QFT
More background?
Nov
9
comment Quantum mechanics as a Markov process
Hmm, this could be an interesting question, but can you provide more background and expand the question a little bit?
Oct
30
comment Explicit construction for unitary extensions of CPTP maps?
There used to be Joe Fitzsimmons' answer here, what happened?
Oct
30
comment Relevance of SIC-POVMs to quantum information
Thanks for the answer, though my question should be interpreted as - are there scenarios where a "good enough" result can be obtained without having a SIC-POVM in hand? In other words, is the relative payoff of having a SIC-POVM, as opposed to using some other, perhaps approximate, methods, worth the difficulty of constructing them?
Oct
26
comment Relevance of SIC-POVMs to quantum information
@Matty - yes, that counts, too.
Oct
16
comment Connections of iterative solvers for large systems of equation in Physics?
What would the purpose of such a list?
Oct
15
comment Physical interpretation to the category of CFTs
I think a good question should be self-contained. This one is not. What's a VOA, what is the relation between your question and the question you're linking to? Please provide more background.
Sep
23
comment Bell polytopes with nontrivial symmetries
Thanks for the reference. Though, the author doesn't actually seem to prove that there are no symmetries but the $n!2^n$ trivial ones - he only identifies these symmetries and claims that they generate the full group (maybe it follows from some facts about polytopes, I don't know).
Sep
20
comment Do Gauge Theories (CFTs) Have Phase Transitions as the 't Hooft Coupling is Varied?
I can't edit, but making stuff like 0811.3001 hyperlinks would be nice.
Sep
15
comment Is there a Majorana-like representation for singlet states?
I think the question should be expanded a little bit.