Quantum LOSR networks cannot generate graph states with high fidelity
| Autor: | Wang, Yi-Xuan, Xu, Zhen-Peng, Gühne, Otfried |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | npj Quantum Inf. 10, 11 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41534-024-00806-z |
| Popis: | Quantum networks lead to novel notions of locality and correlations and an important problem concerns the question of which quantum states can be experimentally prepared with a given network structure and devices and which not. We prove that all multi-qubit graph states arising from a connected graph cannot originate from any quantum network with bipartite sources, as long as feed-forward and quantum memories are not available. Moreover, the fidelity of a multi-qubit graph state and any network state cannot exceed $9/10$. Similar results can also be established for a large class of multi-qudit graph states. Comment: 5+11 pages, 5 figures. accepted version |
| Databáze: | arXiv |
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