Experimental application of decoherence-free subspaces in a   quantum-computing algorithm
  For a practical quantum computer to operate, it will be essential to properly manage decoherence. One important technique for doing this is the use of "decoherence-free subspaces" (DFSs), which have recently been demonstrated. Here we present the first use of DFSs to improve the performance of a quantum algorithm. An optical implementation of the Deutsch-Jozsa algorithm can be made insensitive to a particular class of phase noise by encoding information in the appropriate subspaces; we observe a reduction of the error rate from 35% to essentially its pre-noise value of 8%. 
Masoud Mohseni, Jeffrey S. Lundeen, Kevin J. Resch, and Aephraim M.   Steinberg