Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs
Abstract We study the limits of bipartite entanglement distribution using a chain of quantum repeaters that have quantum memories. To generate end-to-end entanglement, each node can attempt the generation of an entangled link with a neighbor, or perform an entanglement swapping measurement. A maximu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-05-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-023-00713-9 |
| _version_ | 1797831941647499264 |
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| author | Álvaro G. Iñesta Gayane Vardoyan Lara Scavuzzo Stephanie Wehner |
| author_facet | Álvaro G. Iñesta Gayane Vardoyan Lara Scavuzzo Stephanie Wehner |
| author_sort | Álvaro G. Iñesta |
| collection | DOAJ |
| description | Abstract We study the limits of bipartite entanglement distribution using a chain of quantum repeaters that have quantum memories. To generate end-to-end entanglement, each node can attempt the generation of an entangled link with a neighbor, or perform an entanglement swapping measurement. A maximum storage time, known as cutoff, is enforced on the memories to ensure high-quality entanglement. Nodes follow a policy that determines when to perform each operation. Global-knowledge policies take into account all the information about the entanglement already produced. Here, we find global-knowledge policies that minimize the expected time to produce end-to-end entanglement. Our methods are based on Markov decision processes and value and policy iteration. We compare optimal policies to a policy in which nodes only use local information. We find that the advantage in expected delivery time provided by an optimal global-knowledge policy increases with increasing number of nodes and decreasing probability of successful swapping. |
| first_indexed | 2024-04-09T14:00:53Z |
| format | Article |
| id | doaj.art-35d078754e594563b98e2a58675e6eb3 |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-04-09T14:00:53Z |
| publishDate | 2023-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-35d078754e594563b98e2a58675e6eb32023-05-07T11:19:40ZengNature Portfolionpj Quantum Information2056-63872023-05-01911710.1038/s41534-023-00713-9Optimal entanglement distribution policies in homogeneous repeater chains with cutoffsÁlvaro G. Iñesta0Gayane Vardoyan1Lara Scavuzzo2Stephanie Wehner3QuTech, Delft University of TechnologyQuTech, Delft University of TechnologyEEMCS, Delft University of TechnologyQuTech, Delft University of TechnologyAbstract We study the limits of bipartite entanglement distribution using a chain of quantum repeaters that have quantum memories. To generate end-to-end entanglement, each node can attempt the generation of an entangled link with a neighbor, or perform an entanglement swapping measurement. A maximum storage time, known as cutoff, is enforced on the memories to ensure high-quality entanglement. Nodes follow a policy that determines when to perform each operation. Global-knowledge policies take into account all the information about the entanglement already produced. Here, we find global-knowledge policies that minimize the expected time to produce end-to-end entanglement. Our methods are based on Markov decision processes and value and policy iteration. We compare optimal policies to a policy in which nodes only use local information. We find that the advantage in expected delivery time provided by an optimal global-knowledge policy increases with increasing number of nodes and decreasing probability of successful swapping.https://doi.org/10.1038/s41534-023-00713-9 |
| spellingShingle | Álvaro G. Iñesta Gayane Vardoyan Lara Scavuzzo Stephanie Wehner Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs npj Quantum Information |
| title | Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| title_full | Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| title_fullStr | Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| title_full_unstemmed | Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| title_short | Optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| title_sort | optimal entanglement distribution policies in homogeneous repeater chains with cutoffs |
| url | https://doi.org/10.1038/s41534-023-00713-9 |
| work_keys_str_mv | AT alvaroginesta optimalentanglementdistributionpoliciesinhomogeneousrepeaterchainswithcutoffs AT gayanevardoyan optimalentanglementdistributionpoliciesinhomogeneousrepeaterchainswithcutoffs AT larascavuzzo optimalentanglementdistributionpoliciesinhomogeneousrepeaterchainswithcutoffs AT stephaniewehner optimalentanglementdistributionpoliciesinhomogeneousrepeaterchainswithcutoffs |