去极化信道的多次量子纠错

Multiple quantum-error correction for depolarizing channel

本文利用量子过程层析成像建立了一个适用于多次量子纠错的通用方案,以去极化信道为例,说明了此方案的可行性.发现单次纠错之后等价量子噪声信道.依然可以看作是保真度提高的去极化信道,且保真度的提高有着严格的解析表达式.在对初始信道保真度要求不高的情况下,能够很好地实现多次纠错,让其保真度达到需要的精度.

We present a general scheme for multiple quantum-error correction by using quantum process tomography.Taking the depolarizing channel for example,we find the noise channel can still be regarded as a depolarizing channel and the fidelity which can be analytically calculated increases after a one layer quantum-error correction.The scheme can be well performed even when the fidelity of the initial channel is not very ideal.