Stabilisation of Quantum Computations by Symmetrisation

Details Stabilisation of Quantum Computations by Symmetrisation Stabilisation of Quantum Computations by Symmetrisation

1996-04-25

arxiv.org/abs/quant-ph/9604028v1

Physics

Quantum Physics

20 pages LaTeX, 2 postscript figures

Scientific paper

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.

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