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- Title
Fully controllable time-bin entangled states distributed over 100-km single-mode fibers.
- Authors
Kim, Jinwoo; Park, Jiho; Kim, Hong-Seok; Kim, Guhwan; Kim, Jin Tae; Park, Jaegyu; Moon, Kiwon; Kwak, Seung-Chan; Kim, Min-su; Ju, Jung Jin
- Abstract
Quantum networks that can perform user-defined protocols beyond quantum key distribution will require fully controllable entangled quantum states. To expand the available space of generated time-bin entangled states, we demonstrate a time-bin entangled photon source that produces qubit states | ψ 〉 = α | 00 〉 + β | 11 〉 with fully controllable phase and amplitudes. Eight different two-photon states have been selected and prepared from arbitrary states on the reduced two-qubit Bloch sphere. The photon pairs encoded in the time-bin scheme were generated at 2.4 MHz with a visibility of V = 0.9475 ± 0.0016 , with a violation of the CHSH Bell's inequality by 197 standard deviations. After entanglement distribution over 100 km of single-mode fibers, we obtained a visibility of V = 0.9541 ± 0.0113 with a violation of the CHSH Bell's inequality by 6 standard deviations. The prepared states had an average fidelity of 0.9540 ± 0.0016 at the source and an average fidelity of 0.9353 − 0.0209 + 0.0100 after entanglement distribution, which shows that the quantum states generated by our time-bin entangled photon source can be fully controlled potentially to a level applicable to long-distance advanced quantum network systems.
- Subjects
QUANTUM entanglement; BELL'S theorem; QUANTUM states; SINGLE-mode optical fibers; PHOTON pairs; QUANTUM cryptography; QUANTUM networks (Optics)
- Publication
EPJ Quantum Technology, 2024, Vol 11, Issue 1, p1
- ISSN
2196-0763
- Publication type
Article
- DOI
10.1140/epjqt/s40507-024-00267-5