Thomas Hansen

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seen Sep 18 '12 at 17:20

Aug
21
comment Efficiently distinguishing mixed quantum states?
Given two states is straight forward to figure out how well to distinguish them (trace norm distance), but yeah, I'm lost on efficency. I cannot really make many copies, as it is one specific state I'm given, that I want to check. Maybe being concrete will help my question, I want to make sure that I have the following state (or something very close): \rho = \sum_{r_0,r_1 \in {0,1}^n} |\psi_{r_0,r_1}> <\psi_{r_0,r_1}| where |\psi_{r_0,r_1}> = |(|0>|r_0> + |1>|r_1>) I know how to create this mixed state, but how do I, efficiently check it?
Aug
21
awarded  Student
Aug
20
asked Efficiently distinguishing mixed quantum states?