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arXiv 1111.3930quant-ph
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Shor态在[7,1,3]量子纠错码中的应用

On the Use of Shor States for the [7,1,3] Quantum Error Correcting Code

Yaakov S. Weinstein, Sidney D. Buchbinder

摘要:

研究了在非等概率错误环境下,Shor态构造方法对[[7,1,3]] Calderbank-Shor-Steane量子纠错码的逻辑态编码和量子纠错的影响.我们确定的最佳数量的验证步骤中使用的Shor状态的建设和Shor状态是否没有验证可用于实际的量子计算。这些结果进行了比较,相同的过程中的编码和纠错的Shor状态不使用。我们证明了没有一阶误差项的逻辑零态的构造可能不需要量子容错的完全建立。关于纠错,我们表明,对于特定的初始状态,使用单个量子位进行校正子测量的纠错产生与使用Shor状态作为校正子量子位的纠错相似的输出状态精度。此外,我们证明了与Shor状态的错误校正具有固有的敏感性位翻转错误。最后,我们建议,在这种类型的错误校正的情况下,应该总是重复一个综合征测量,直到达到一个全零读数(两次在行)。

英文摘要:

We explore the effect of Shor state construction methods on logical state encoding and quantum error correction for the [[7,1,3]] Calderbank-Shor-Steane quantum error correction code in a nonequiprobable error environment. We determine the optimum number of verification steps to be used in Shor state construction and whether Shor states without verification are usable for practical quantum computation. These results are compared to the same processes of encoding and error correction where Shor states are not used. We demonstrate that the construction of logical zero states with no first order error terms may not require the complete edifice of quantum fault tolerance. With respect to error correction, we show for a particular initial state that error correction using a single qubit for syndrome measurement yields a similar output state accuracy to error correction using Shor states as syndrome qubits. In addition, we demonstrate that error correction with Shor states has an inherent sensitivity to bit-flip errors. Finally, we suggest that in this type of error correction scenario one should always repeat a syndrome measurement until attaining an all zero readout (twice in row).

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