This paper shows that it is possible to piggyback classical information on a stream of qubits protected by quantum error-correcting codes. The piggyback channel can be created by introducing intentional errors corresponding to a controlled sequence of syndromes. These syndromes are further protected, when quantum noise is present, by classical error-correcting codes according to a performance-delay trade-off. Classical information can thus be added and extracted at arbitrary epochs without consuming additional quantum resources and without disturbing the quantum stream.

中文翻译：

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quantum带量子流

本文表明，可以在受量子纠错码保护的量子比特流上搭载经典信息。可以通过引入与受控症状序列相对应的故意错误来创建搭载通道。当存在量子噪声时，可以通过根据性能延迟权衡的经典纠错码进一步保护这些综合症。因此，可以在任意时期添加和提取经典信息，而无需消耗额外的量子资源，也不会干扰量子流。