量子计算的对称化稳定化
Stabilisation of Quantum Computations by Symmetrisation
摘要：
我们提出了一种量子计算（包括量子态存储）的稳定化方法。该方法是基于投影到$\cal SYM$的操作，$\cal SYM$是计算机的$R$冗余副本的全状态空间的对称子空间。我们描述了一个有效的算法和量子网络影响$\cal SYM$ -投影和讨论所提出的方法的稳定效果的背景下，由硬件不精确产生的酉误差，和非酉误差所产生的外部环境相互作用。最后，讨论了该方法的局限性。
英文摘要：
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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