It was shown by Ahn, Wiseman, and Milburn [Phys. Rev. A 67, 052310 (2003)] that feedback control could be used as a quantum error correction process for errors induced by weak continuous measurement, given one perfectly measured error channel per qubit. Here we point out that this method can be easily extended to an arbitrary number of error channels per qubit. We show that the feedback protocols generated by our method encode n-2 logical qubits in n physical qubits, thus requiring just one more physical qubit than in the previous case.
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机译：它由安，怀斯曼和米尔本（Phys。 Rev. A 67，052310（2003）]中指出，如果每个qubit一个完美测量的误差通道，则反馈控制可用作对弱连续测量引起的误差的量子误差校正过程。在这里，我们指出，该方法可以轻松扩展到每个qubit任意数量的错误通道。我们表明，由我们的方法生成的反馈协议将n-2个逻辑量子位编码为n个物理量子位，因此与前一种情况相比，仅需要一个物理量子位。
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