51. Experimental Observation of Coherent-Information Superadditivity in a Dephrasure Channel.
- Author
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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, and Guang-Can Guo
- Subjects
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NOISE - Abstract
We present an experimental approach to construct a dephrasure channel that contains both dephasing and erasure noises and can be used as an efficient tool to study the superadditivity of coherent information. 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, with a larger number of channel uses the quantum capacity becomes positive. These phenomena exhibit a more obvious superadditivity of coherent information than previous works and demonstrate a higher threshold for nonzero quantum capacity. Such novel channels built in our experiment also can provide a useful platform to study the nonadditive properties of coherent information and quantum channel capacity. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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