Nonlinear semiconductor-nanostructures for quantum optics applications

Project funded by Swedish Research Council (Project grant), grant 2018-03457_VR. Participating organisations named by the source: KTH, Royal Institute of Technology. Funded amount: SEK 3,295,000, as stated by the source. Runs 2019-01-01 to 2022-12-31. Keywords: Naturvetenskap, Natural Sciences, Fysik, Physical Sciences, Atom- och molekylfysik och optik, Atom and Molecular Physics and Optics. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2025-12-05); national funding data, not CORDIS. Abstract given by the source: Entangled quantum-state generation is an essential technology for the realization of quantum information systems. In semiconductor nanostructures, due to the high refractive index contrast, both the strong mode- confinement and the optical nonlinearity can be utilized for the spontaneous parametric down-conversion process and subsequently to create a source of entangled photons. The bulk optical nonlinearity resulting from the crystal symmetry as well as an enhanced optical nonlinearity at the surface interface will be utilized for the light generation. This project requires fundamental studies of the spontaneous emission in semiconductor nanostructures with the main focus on cavity systems and a resonant optical field interaction where engineering of guided modes excitation and the mode conversion in nano-scale devices are essential. The nanostructures can be integrated with a semiconductor laser (optical pump) to realize a very compact source of polarization-entangled photon-pairs. Such a source, operating in non-demanding temperature, can be easily applied in mobile quantum-key distribution systems including satellites or sensors. Due to the possibility for high integration of individual nanostructures, an array of entangled-photon sources will also be investigated. In particular, the two-photon interference pattern and the distribution of the second-order coherence functions will be evaluated for applications in both: quantum imaging and quantum cryptography.

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Swedish Research Council. Retrieved 2026-10-28. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: The project "Nonlinear semiconductor-nanostructures for quantum optics applications" is funded by the Swedish Research Council with a grant of SEK 3,295,000, running from January 1, 2019, to December 31, 2022, involving KTH, Royal Institute of Technology. Suggested technology pillar: enabling. Generated by AI from the public source text; it may contain errors and the original source is authoritative.