An efficient quantum algorithm for the Moebius function
  We give an efficient quantum algorithm for the Moebius function $\mu(n)$ from the natural numbers to $\{-1,0,1\}$. The cost of the algorithm is asymptotically quadratic in $\log n$ and does not require the computation of the prime factorization of $n$ as an intermediate step. 
Peter J. Love
quant-ph