Optimal estimation of an observable's expectation value for pure states for general measure of deviation
Horibe, Minoru · Hayashi, Akihisa · Hashimoto, Takaaki
Original · EN
We investigate the optimal estimation of quantum expectation value of a physical observable, which minimizes a mean error with respect to general measure of deviation, when a finite number of copies of a pure state are prepared. If pure sates are uniformly distributed, the minimum value of mean error for any measure of deviation is achieved by projective measurement on each copy.
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