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comment Does entropy measure extractable work?
@WetSavannaAnimalakaRodVance Most of the work on this topic postdates Jayne's papers, so they are far from the last word on the subject. I'm not really sure what you mean by the "ensemble" being well defined. For any quantum system $p_i$ is well defined, since they are simply the eigenvalues of the density matrix.
Nov
3
comment Does entropy measure extractable work?
@WetSavannaAnimalakaRodVance: I'm afraid I don't see how this is related to the questions or answers. I don't believe any of us are discussing the ability to accurately infer entropy from measurements, but rather whether three concepts (work extraction, information theoretic entropy and physical entropy) are equivalent.
Nov
3
comment Does entropy measure extractable work?
@WetSavannaAnimalakaRodVance Sure, but something like the von Neumann entropy of a state is always defined. It doesn't depend on the system being in a Gibb's state, and hence doesn't require temperature to be defined.
Oct
9
comment What can the D-Wave quantum computer do?
@Blaisorblade: I meant that the converse can't be shown easily (i.e. that it is not NP-complete). Regarding noise, I use "noise" as a synonym of "decoherence".
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