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Quantum Information Processing

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01-02-2020

Discriminating two non-orthogonal states against decoherence by feedback control

Authors: Yu-Guang Yang, Ning Chen, Yong-Li Yang, Yi-Hua Zhou, Wei-Min Shi

Published in: Quantum Information Processing | Issue 2/2020

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Abstract

Guo et al. (Phys Rev A 91(2):022321, 2015) introduced the feed-forward control to realize a better effect of discrimination of two non-orthogonal states against noise. However, the better effect of discrimination is achieved in a probabilistic way. To solve the problem, we introduce the feedback control to discriminate two non-orthogonal states against noise. It is shown that it can improve the effect of discrimination for any pair of non-orthogonal states and any strength of amplitude damping noise largely in a deterministic way. In particular, our optimum probability of discrimination can be higher than that of discriminating two initial non-orthogonal pure states for not only equal a priori probabilities but also unequal a priori probabilities. We also examine the approach in the presence of different noise sources and find it works well for all typical types of noise sources ranging from a single type of noise to the combination of different types of noise.

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Title: Discriminating two non-orthogonal states against decoherence by feedback control
Authors: Yu-Guang Yang
Ning Chen
Yong-Li Yang
Yi-Hua Zhou
Wei-Min Shi
Publication date: 01-02-2020
Publisher: Springer US
Published in: Quantum Information Processing / Issue 2/2020
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-019-2568-z

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