Entanglement of Nanophotonic Quantum Memory Nodes in a Telecom Network
| Autor: | Knaut, Can M., Suleymanzade, Aziza, Wei, Yan-Cheng, Assumpcao, Daniel R., Stas, Pieter-Jan, Huan, Yan Qi, Machielse, Bartholomeus, Knall, Erik N., Sutula, Madison, Baranes, Gefen, Sinclair, Neil, De-Eknamkul, Chawina, Levonian, David S., Bhaskar, Mihir K., Park, Hongkun, Lončar, Marko, Lukin, Mikhail D. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Nature 629, 573 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41586-024-07252-z |
| Popis: | A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected via fiber optical infrastructure. Here, we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centers in nanophotonic diamond cavities integrated with a telecommunication (telecom) fiber network. Remote entanglement is generated via the cavity-enhanced interactions between the SiV's electron spin qubits and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bi-directional quantum frequency conversion of photonic communication qubits to telecom frequencies (1350 nm), we demonstrate entanglement of two nuclear spin memories through 40 km spools of low-loss fiber and a 35 km long fiber loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks. Comment: 23 pages, 16 figures |
| Databáze: | arXiv |
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