1996/04/25 by Adriano Barenco, Barenco, Adriano, Andre` Berthiaume +9 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/9604028
20 pages LaTeX, 2 postscript figures
arxiv created 1996/04/25 · arxiv updated 2009/12/01
We propose a method for the stabilisation of quantum computations (including quantum state storage). The method is based on the operation of projection into \cal SYM, the symmetric subspace of the full state space of R redundant copies of the computer. We describe an efficient algorithm and quantum network effecting \cal SYM--projection and discuss the stabilising effect of the proposed method in the context of unitary errors generated by hardware imprecision, and nonunitary errors arising from external environmental interaction. Finally, limitations of the method are discussed.