an:01467820
Zbl 0967.81004
Rozono??r, L. I.
Determination of a state of a quantum system from results of measurements
EN
Probl. Inf. Transm. 35, No. 4, 359-368 (1999); translation from Probl. Peredachi Inf. 35, No. 4, 84-94 (1999).
00064748
1999
j
81P15
determining a pure state; mixed state
Summary: It is shown that for determining a pure state of a quantum system (in a finite- or infinite-dimensional case), it suffices to measure four certain observables, and any two of them are not sufficient. Another problem considered is the determination of a mixed state in the finite-dimensional case where the space dimension \(N\) is not a prime number.