20.500.12556/DiRROS-25308 Electrically and geometrically tunable photon pair entanglement from ferroelectric nematic liquid crystal Entangled photons are a cornerstone of quantum technologies, enabling applications from secure communication to quantum computing. A longstanding challenge is to develop a compact source that would generate polarization-entangled photons with tunable quantum state on demand. The promising materials for such sources are ferroelectric nematic liquid crystals (FNLCs), due to their nonlinear optical properties and easily controllable configuration. In this work, it is demonstrated that the polarization state and the degree of entanglement of photon pairs generated within FNLCs can be changed in a controllable and reversible manner. First, tuning of the entanglement is demonstrated via sample geometry with twisted FNLC configurations in a sample of varying thickness. Secondly, by applying an electric field, the degree of entanglement can be tuned in real time. In both scenarios, the degree of entanglement can be adjusted from nearly entirely separate photons to fully entangled. These findings represent a significant step toward tunable quantum sources that can produce any desired polarization state on demand. In the future, by adding more electrodes, different parts of the sample could be controlled individually, allowing for the creation of pixelated quantum light sources. photon entanglement ferroelectric nematic liquid crystal tunability feroelektrični nematski tekoči kristali true false true Wiley-VCH GmbH Nemčija Angleški jezik Slovenski jezik © 2025 The Author(s). Neznano 2026-01-15 15:01:16 2026-01-15 15:01:17 2026-01-17 03:48:38 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Soavtorji: Aljaž Kavčič, Nerea Sebastián, Matjaž Humar; Opis vira z dne 15. 1. 2026; str. 1-10 iss. Vol. [in press] 2025 0000-00-00 Zaloznikova Objavljeno apc 2025-08-08 2025-10-07 2025-10-24 53 2198-3844 10.1002/advs.202515206 264859907 https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/advs.202515206 1 ab2a4727-f21a-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38258 RAZ_Klopcic_Sara_2025.pdf RAZ_Klopcic_Sara_2025.pdf 1 94FE669424F9E914A5B78507AC8C2794 95c4e4492ba97514f0424696c2d88aa9a7552e2fea7cbda8e4e9e3fc2d6cb192 00054c38-f21b-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=38259 Institut Jožef Stefan 0 0 0