Psy-Kosh comments on Spooky Action at a Distance: The No-Communication Theorem - Less Wrong

10 Post author: Eliezer_Yudkowsky 05 May 2008 02:43AM

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Comment author: Psy-Kosh 05 May 2008 05:06:29AM 1 point [-]

Scott: I'm a bit confused by what you're doing here: TrA[UA マ、B UA*] = マ。

Specifically, I understand what a trace is, but what's TrA mean? ie, I'm guessing it's not a scalar given that it looks like multiplying (if that's the intended operation) it by the transformed density matrix of AB gives you a density matrix of B, which presumably has fewer dimensions.