On mutually unbiased bases: Passing from d to d**2
  We show how to transform the problem of finding d+1 mutually unbiased bases in the d-dimensional Hilbert space into the one of finding d(d+1) vectors in the N-dimensional Hilbert space with N=d**2. The transformation formulas admit a solution when d is a prime number. 
Maurice Robert Kibler (IPNL)
quant-ph math-ph math.MP