| Autor: |
Yu, Shang, Meng, Yu, Patel, Raj B., Wang, Yi-Tao, Ke, Zhi-Jin, Liu, Wei, Li, Zhi-Peng, Yang, Yuan-Ze, Zhang, Wen-Hao, Tang, Jian-Shun, Li, Chuan-Feng, Guo, Guang-Can |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Lett. 125, 060502 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.125.060502 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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