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Discriminating two nonorthogonal states against a noise channel by feed-forward control

We propose a scheme by using the feed-forward control (FFC) to realize a better effect of discrimination of two nonorthogonal states after passing a noise channel based on the minimum- error (ME) discrimination. We show that the application of our scheme can highly improve the effect of discrimination compared with the ME discrimination without the FFC for any pair of nonorthogonal states and any degree of amplitude damping (AD). Especially, the effect of our optimal discrimination can reach that of the two initial nonorthogonal pure states in the presence of the noise channel in a deterministic way for equal a prior probabilities or even be better than that in a probabilistically way for unequal a prior probabilities.

preprint2015arXivOpen access
Li-Sha GuoBao-Ming XuJian ZouChao-Quan WangHai-LiJun-Gang LiBin Shao
quant-ph
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Open access7 authors1 topic
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Li-Sha GuoBao-Ming XuJian ZouChao-Quan WangHai-LiJun-Gang LiBin Shao

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