Experimental Observation of Coherent-Information Superadditivity in a Dephrasure Channel.,Physical Review Letters

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Experimental Observation of Coherent-Information Superadditivity in a Dephrasure Channel.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-08-06 , DOI: 10.1103/physrevlett.125.060502
Shang Yu _{1,

2} , Yu Meng _{1,

2} , Raj B Patel ₃ , Yi-Tao Wang _{1,

2} , Zhi-Jin Ke _{1,

2} , Wei Liu _{1,

2} , Zhi-Peng Li _{1,

2} , Yuan-Ze Yang _{1,

2} , Wen-Hao Zhang _{1,

2} , Jian-Shun Tang _{1,

2} , Chuan-Feng Li _{1,

2} , Guang-Can Guo _{1,

2}

Affiliation

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.

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