Optimal error tracking via quantum coding and continuous syndrome measurement
Optimal error tracking via quantum coding and continuous syndrome measurement
复制标题
通过量子编码和连续综合症测量进行最佳错误跟踪
DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
H. Mabuchi
中科院分区:
文献类型:
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作者:
R. Handel;H. Mabuchi
We revisit a scenario of continuous quantum error detection proposed by Ahn, Doherty and Landahl [Phys. Rev. A 65, 042301 (2002)] and construct optimal filters for tracking accumulative errors. These filters turn out to be of a canonical form from hybrid control theory; we numerically assess their performance for the bit-flip and five-qubit codes. We show that a tight upper bound on the stochastic decay of encoded fidelity can be computed from the measurement records. Our results provide an informative case study in decoherence suppression with finite-strength measurement.