Certifying high-dimensional quantum channels

Article Article scientifique Article Certifying high-dimensional quantum channels eng 2025-09-09 author Engineer Sophie https://orcid.org/0009-0000-9152-8676 author Goel Suraj https://orcid.org/0000-0001-8847-4830 author Egelhaaf Sophie https://orcid.org/0009-0006-4769-8161 Université de Genève 983849 Serv com physique appliquée (FIGCO) author McCutcheon Will https://orcid.org/0000-0003-0344-6385 author Srivastav Vatshal https://orcid.org/0000-0002-0586-5498 author Leedumrongwatthanakun Saroch https://orcid.org/0000-0002-9915-4207 author Wollmann Sabine author Jones Benjamin D. M. author Cope Thomas author Brunner Nicolas Université de Genève 510523 Serv com physique appliquée (FIGCO) author Uola Roope Kristian https://orcid.org/0000-0003-3417-4458 Université de Genève 916418 author Malik Mehul https://orcid.org/0000-0001-8395-160X 033233 10.1103/bwd5-wx7j 2643-1564 https://link.aps.org/doi/10.1103/bwd5-wx7j <p>The use of high-dimensional systems for quantum communication opens interesting perspectives, such as increased information capacity and noise resilience. In this context, it is crucial to certify that a given quantum channel can reliably transmit high-dimensional quantum information. Here we develop efficient methods for the characterization of high-dimensional quantum channels. We first present a notion of dimensionality of quantum channels and develop efficient certification methods for this quantity. We consider a simple prepare-and-measure setup and provide witnesses for both a fully and a partially trusted scenario. In turn, we apply these methods to a photonic experiment and certify dimensionalities up to 59 for a commercial graded-index multimode optical fiber. Moreover, we present extensive numerical simulations of the experiment, providing an accurate noise model for the fiber and exploring the potential of more sophisticated witnesses. Our work demonstrates the efficient characterization of high-dimensional quantum channels, a key ingredient for future quantum communication technologies.</p> Dewey 500.2 European Commission 89224 Engineering and Physical Sciences Research Council EP/SO23607/1 Royal Academy of Engineering CiET-2223-112 Swiss Secretariat for Education, Research and Innovation UeM019-3 Swiss National Science Foundation Quantum measurement resources: theory and applications 202179 CH Careers European Commission Photonics for High-Dimensional Quantum Networking 950402 PIQUaNT EU H2020 35 Groupe de physique appliquée 135 false 801 Groupe Brunner Physical review research 7 3 c0f7865b-7a26-41e6-925f-59a32b715846 Article (Published version) Public Article_scientifique_from_crossref.pdf 1862028 application/pdf CC BY-4.0 07359b971489058464e486272db6b482d314420baa14dcb8b4922250041f07f6 openAccess Faculté des sciences / Section de physique / Groupe de physique appliquée

Title	Published in	Year	Views	Downloads

Certification of Quantum Resources		2026	32	33
Certifying measurement incompatibility in prepare-and-measure and Bell scenarios	Journal of physics. A, Mathematical and theoretical	2025	6	7
Certifying high-dimensional quantum channels	Physical review research	2025	32	269

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