whErefore, the minimizing conditional entropy of Ac system could be obtained by calculating the EoF of BC- system Thus through the method conducted by l= Wootters(phys. rev. let 80.2245), the decomposition achieving the EoF can be deduced oo So the measurement corresponding to minimizing conditional entropy can be determined by 平A)=)= 令 Thus the measurement is:∏4=1(±e:o) , where e is the normalized vector and 0 2入2(X2+ =12×2(1c089+2入4) e3❖ Therefore, the minimizing conditional entropy of AC￾system could be obtained by calculating the EoF of BC￾system. ❖ Thus through the method conducted by Wootters(phys.rev.let.80.2245),the decomposition achieving the EoF can be deduced. ❖ So the measurement corresponding to minimizing conditional entropy can be determined by: ❖ Thus the measurement is: ❖ where is the normalized vector , and   i BC z i ABC A BC i  =  i z ( ) 1 2 A  =   I e  e