Optimal generalized quantum measurements for arbitrary spin systems
arXiv:quant-ph/9904056 · doi:10.1103/PhysRevA.61.022113
Abstract
Positive operator valued measurements on a finite number of N identically prepared systems of arbitrary spin J are discussed. Pure states are characterized in terms of Bloch-like vectors restricted by a SU(2 J+1) covariant constraint. This representation allows for a simple description of the equations to be fulfilled by optimal measurements. We explicitly find the minimal POVM for the N=2 case, a rigorous bound for N=3 and set up the analysis for arbitrary N.
LateX, 12 pages