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location Warsaw, Poland
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visits member for 3 years, 5 months
seen Feb 19 at 15:20

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


Nov
11
awarded  Yearling
Aug
30
awarded  Popular Question
May
4
awarded  Nice Question
May
4
awarded  Commentator
May
4
awarded  Nice Question
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awarded  Teacher
May
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awarded  Scholar
May
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awarded  Nice Question
Apr
8
comment Geometric picture behind quantum expanders
I don't see how is this supposed to help.
Apr
4
asked Geometric picture behind quantum expanders
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.
Jan
31
accepted Bell polytopes with nontrivial symmetries
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
11
awarded  Yearling
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.