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arXiv · 2003.13000

Experimental observation of coherent-information superadditivity in a dephrasure channel

Shang Yu·Yu Meng·Raj B. Patel·Yi-Tao Wang·Zhi-Jin Ke·Wei Liu·Zhi-Peng Li·Yuan-Ze Yang·Wen-Hao Zhang·Jian-Shun Tang·Chuan-Feng Li·Guang-Can Guo
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Abstract

We present an experimental approach to construct a dephrasure channel, which contains both dephasing and erasure noises, and can be used as an efficient tool to study the superadditivity of coherent information. By using a three-fold dephrasure channel, the superadditivity of coherent information is observed, and a substantial gap is found between the zero single-letter coherent information and zero quantum capacity. Particularly, we find that when the coherent information of n channel uses is zero, in the case of larger number of channel uses, it will become positive. These phenomena exhibit a more obvious superadditivity of coherent information than previous works, and demonstrate a higher threshold for non-zero quantum capacity. Such novel channels built in our experiment also can provide a useful platform to study the non-additive properties of coherent information and quantum channel capacity.

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Shang Yu, Yu Meng, Raj B. Patel, Yi-Tao Wang, Zhi-Jin Ke, Wei Liu, Zhi-Peng Li, Yuan-Ze Yang, Wen-Hao Zhang, Jian-Shun Tang, Chuan-Feng Li, Guang-Can Guo. 2020-03-29. Experimental observation of coherent-information superadditivity in a dephrasure channel. https://doi.org/10.1103/physrevlett.125.060502

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