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
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The photon pairs encoded in the time-bin scheme were generated at 2.4 MHz with a visibility of <span>\\(V = 0.9475 \\pm 0.0016\\)</span>, 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 <span>\\(V = 0.9541 \\pm 0.0113\\)</span> with a violation of the CHSH Bell’s inequality by 6 standard deviations. The prepared states had an average fidelity of <span>\\(0.9540 \\pm 0.0016\\)</span> at the source and an average fidelity of <span>\\(0.9353 ^{+0.0100}_{-0.0209}\\)</span> 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.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-024-00267-5","citationCount":"0","resultStr":"{\"title\":\"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\",\"doi\":\"10.1140/epjqt/s40507-024-00267-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 <span>\\\\(|{\\\\psi}\\\\rangle = \\\\alpha |{00}\\\\rangle + \\\\beta |{11}\\\\rangle \\\\)</span> 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 <span>\\\\(V = 0.9475 \\\\pm 0.0016\\\\)</span>, 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 <span>\\\\(V = 0.9541 \\\\pm 0.0113\\\\)</span> with a violation of the CHSH Bell’s inequality by 6 standard deviations. 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Fully controllable time-bin entangled states distributed over 100-km single-mode fibers
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 \(|{\psi}\rangle = \alpha |{00}\rangle + \beta |{11}\rangle \) 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 \(V = 0.9475 \pm 0.0016\), 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 \(V = 0.9541 \pm 0.0113\) with a violation of the CHSH Bell’s inequality by 6 standard deviations. The prepared states had an average fidelity of \(0.9540 \pm 0.0016\) at the source and an average fidelity of \(0.9353 ^{+0.0100}_{-0.0209}\) 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.
期刊介绍:
Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics.
EPJ Quantum Technology covers theoretical and experimental advances in subjects including but not limited to the following:
Quantum measurement, metrology and lithography
Quantum complex systems, networks and cellular automata
Quantum electromechanical systems
Quantum optomechanical systems
Quantum machines, engineering and nanorobotics
Quantum control theory
Quantum information, communication and computation
Quantum thermodynamics
Quantum metamaterials
The effect of Casimir forces on micro- and nano-electromechanical systems
Quantum biology
Quantum sensing
Hybrid quantum systems
Quantum simulations.