Peres-Wootters Measurement for Three Nonorthogonal States

초록

We consider the Peres-Wootters measurement for three nonorthogonal states, |0 >, cos theta|0 >+sin theta|1 >, and cos theta|0 > a'sin theta|1 > (0 <theta <pi/2). We calculate probabilities to obtain the correct outcomes by the method and compare them to probabilities by the general orthogonal measurements. We show that theta=pi/3 if and only if the Peres-Wootters measurement is optimal. We also present numerically that the optimal orthogonal measurement is better than the Peres-Wootters measurement for several cases when theta not equal pi/3.

키워드