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seen Mar 10 at 16:54

Apr
16
awarded  Yearling
May
4
awarded  Yearling
May
4
awarded  Nice Answer
Apr
2
answered States diagonal in the tensor product of Bell states.
Feb
24
answered Constructing a CP map with some decaying property
Feb
14
comment What Hermitian operators can be observables?
You can impose other superselection rules, typically based on some symmetry, not necessarily the exchange symmetry (that applies only for multi-particle systems). I cannot recommend a reference based on my direct knowledge, but I'd say you might start from rmp.aps.org/abstract/RMP/v79/i2/p555_1
Feb
14
comment Can the concurrence be calculated in terms of the entanglement of formation?
By "does not look as nice as" I actually meant that you cannot write it down as a combination of elementary functions. Even just inverting the binary entropy $-x\log x - (1-x)\log (1-x)$ is not possible in this sense, as far as I know. You can just show that the inverse exists, and maybe calculate some properties, or try to expand it in series, but I believe that's it.
Feb
14
answered Can the concurrence be calculated in terms of the entanglement of formation?
Feb
13
answered What Hermitian operators can be observables?
Jan
26
comment Do any entanglement measures for mixed states exist that use only single site correlation functions?
As Joe says, the local spectrum will still tell you something about entanglement if you have some kind of promise/information about the global purity. For example, if $S(\rho_{AB})<S(\rho_A)$, then the state is $A:B$-entangled
Jan
26
answered Do any entanglement measures for mixed states exist that use only single site correlation functions?
Sep
29
comment Does entropy measure extractable work?
More recent results here arxiv.org/abs/0908.0424 and here arxiv.org/abs/1009.1630
Sep
29
answered What is the use of a Universal-NOT gate?
Apr
16
awarded  Teacher
Apr
16
answered Are the basic postulates of QM the only set of postulates that can give rise to a sensible semi-probabilistic physical theory?