2015/10/13 by J. Trapateau, Julien Trapateau, J. Ghalbouni +7 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Computer science #Demultiplexer #Electrical engineering #Engineering #Interferometry #Lithium niobate #Mechanical and Optical Resonators #Multiplexing #Optics #Photon #Photon entanglement #Physics #Quantum #Quantum Information and Cryptography #Quantum channel #Quantum entanglement #Quantum information science #Quantum key distribution #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Spontaneous parametric down-conversion #Telecommunications #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1063/1.4933071
published as J. Appl. Phys. 118, 143106 (2015) · 5 pages, 3 figures
openalex publication_date 2015/10/13 · arxiv created 2015/10/22 · arxiv updated 2015/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We experimentally demonstrate multi-user distribution of polarization entanglement using commercial telecom wavelength division demultiplexers. The entangled photon pairs are generated from a broadband source based on spontaneous parametric down conversion in a periodically poled lithium niobate crystal using a double path setup employing a Michelson interferometer and active phase stabilisation. We test and compare demultiplexers based on various technologies and analyze the effect of their characteristics, such as losses and polarization dependence, on the quality of the distributed entanglement for three channel pairs of each demultiplexer. In all cases, we obtain a Bell inequality violation, whose value depends on the demultiplexer features. This demonstrates that entanglement can be distributed to at least three user pairs of a network from a single source. Additionally, we verify for the best demultiplexer that the violation is maintained when the pairs are distributed over a total channel attenuation corresponding to 20 km of optical fiber. These techniques are therefore suitable for resource-efficient practical implementations of entanglement-based quantum key distribution and other quantum communication network applications.