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Journal Article
Fully controllable time-bin entangled states distributed over 100-km single-mode fibers
- Authors
- Jinwoo Kim, Jiho Park, Hong-Seok Kim, Guhwan Kim, Jin Tae Kim, Jaegyu Park, Kiwon Moon, Seung-Chan Kwak, Min-su Kim, Jung Jin Ju
- Issue Date
- 2024-09
- Citation
- EPJ QUANTUM TECHNOLOGY, v.11, pp.1-15
- ISSN
- 2662-4400
- Publisher
- SPRINGER
- Language
- English
- Type
- Journal Article
- Abstract
- Quantum networks that can perform user-defined protocols beyond quantum key distribution require fully controllable entangled quantum states. To expand the space of generated time-bin entangled states, we demonstrate a time-bin entangled photon source that produces qubit states with fully controllable phases and amplitudes. Eight distinct two-photon states were selected and prepared from arbitrary states on a reduced two-qubit Bloch sphere. Photon pairs encoded in the time-bin scheme were generated at 2.4 MHz with high visibility and a violation of the CHSH Bell’s inequality by 197 standard deviations. After entanglement distribution over 100 km of single-mode fibers, visibility remained high, and the CHSH Bell’s inequality was violated by 6 standard deviations. The prepared states achieved an average fidelity of X at the source and Y after entanglement distribution, demonstrating that the quantum states generated by our time-bin entangled photon source are fully controllable and potentially suitable for long-distance advanced quantum network systems.
- KSP Keywords
- Average fidelity, Bloch sphere, Entangled photon, Entangled states, Long-distance, Network system, Quantum Network, Quantum states, Single-mode fiber(SMF), Two-Photon, User-defined
This work is distributed under the term of Creative Commons License (CCL)
(CC BY NC ND)
(CC BY NC ND)
