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arXiv 0811.3616quant-ph
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关于连续变量量子纠错的一个注记

A note on quantum error correction with continuous variables

Peter van Loock

摘要:

我们证明了基于高斯辅助状态和高斯操作(用于编码、伴随式提取和恢复)的连续变量量子纠错可以非常有用地抑制非高斯错误信道的影响。对于特定类别的随机误差模型,使人联想到通常在量子比特情况下考虑的那些随机误差模型,针对单通道误差设计的量子纠错码可以增强传输准确性,即使在用于传输编码状态的每个通道中发生误差时。实际上,在这种情况下,连续变量格式的纠错能力比离散变量格式的纠错能力要高。

英文摘要:

We demonstrate that continuous-variable quantum error correction based on Gaussian ancilla states and Gaussian operations (for encoding, syndrome extraction, and recovery) can be very useful to suppress the effect of non-Gaussian error channels. For a certain class of stochastic error models, reminiscent of those typically considered in the qubit case, quantum error correction codes designed for single-channel errors may enhance the transfer fidelities even when errors occur in every channel employed for transmitting the encoded state. In fact, in this case, the error-correcting capability of the continuous-variable scheme turns out to be higher than that of its discrete-variable analogues.

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