Experimental implementation of unambiguous quantum reading
  We provide the optimal strategy for unambiguous quantum reading of optical memories, namely when perfect retrieving of information is achieved probabilistically, for the case where noise and loss are negligible. We describe the experimental quantum optical implementations, and provide experimental results for the single photon case. 
Michele Dall'Arno, Alessandro Bisio, Giacomo Mauro D'Ariano, Martina   Mikova, Miroslav Jezek, Miloslav Dusek
quant-ph