Y_quant =

     7     1     0     0     0     0     0     0
    -1     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     1     0     0     0     0     0     0     0
     0    -1     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0