| Autor: |
Zhang, Rui-Qi, Hou, Zhibo, Li, Zihao, Zhu, Huangjun, Xiang, Guo-Yong, Li, Chuan-Feng, Guo, Guang-Can |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Applied 16, 024052 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevApplied.16.024052 |
| Popis: |
Masking of quantum information is a way of hiding information in correlations such that no information is accessible to any local observer. Although the set of all quantum states as a whole cannot be masked into bipartite correlations according to the no-masking theorem, the set of real states is maskable and is a maximal maskable set. In this work, we experimentally realize a masking protocol of the real ququart by virtue of a photonic quantum walk. Our experiment clearly demonstrates that quantum information of the real ququart can be completely hidden in bipartite correlations of two-qubit hybrid entangled states, which are encoded in two different degrees of freedom of a single photon. The hidden information is not accessible from each qubit alone, but can be faithfully retrieved with a fidelity of about 99% from correlation measurements. By contrast, any superset of the set of real density matrices cannot be masked. |
| Databáze: |
arXiv |
| Externí odkaz: |
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