Non-destructive Orthonormal State Discrimination
  We provide explicit quantum circuits for the non-destructive deterministic discrimination of Bell states in the Hilbert space $C^{d^{n}}$, where $d$ is qudit dimension. We discuss a method for generalizing this to non-destructive measurements on any set of orthogonal states distributed among $n$ parties.   From the practical viewpoint, we show that such non-destructive measurements can help lower quantum communication complexity under certain conditions. 
M. Gupta, A. Pathak, R. Srikanth and P.K. Panigrahi