Abstract
Following a method to detect lower bounds of the classical capacity of quantum channels, we extend it to two-qubit correlated channels. Taking the correlated dephasing channel, the correlated depolarizing channel and the fully correlated amplitude damping channel as examples, we illustrate that the scheme is efficient and a tight lower bound could be detected in some circumstances.
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Acknowledgements
This work is supported by Key Research and Development Project of Guang dong Province under Grant No. 2020B0303300001 and the Guangdong Basic and Applied Basic Research Foundation under Grant No. 2020B1515310016. We appreciate Wen Xu for his useful discussion. We thank Chuan-Jie Zhu for reading the draft of the paper.
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Li, MX., Zheng, ZJ. Detecting lower bounds to classical capacity of correlated quantum channels. Eur. Phys. J. Plus 137, 444 (2022). https://doi.org/10.1140/epjp/s13360-022-02665-z
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DOI: https://doi.org/10.1140/epjp/s13360-022-02665-z