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QI: Fachverband Quanteninformation

QI 14: Quantum Entanglement III

QI 14.3: Vortrag

Dienstag, 11. März 2025, 14:45–15:00, HS IX

Entanglement between dependent degrees of freedom: Quasi-particle correlations — •Franziska Barkhausen, Laura Ares Santos, Stefan Schumacher, and Jan Sperling — Paderborn University, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, D-33098 Paderborn, Germany

Common notions of entanglement are based on well-separated subsystems with independent degrees of freedom. However, obtaining such independent degrees of freedom is not always possible because of physical constraints leading to dependent degrees of freedom. We theoretically explore the impact of dependent degrees of freedom on quantum entanglement [1]. As an application for interacting light-matter systems, we specifically study quantum correlation features for quasi-particle descriptions in fermion-boson systems in the Jaynes-Cummings model. Non-entangled quasi-particle states can be expressed through projections that act on tensor-product states leading to linear dependencies and states that are non-entangled although they would be entangled when only focusing on the common, independent description. For example, this enables us to construct NOON-type states which are not entangled for dependent degrees of freedom, unlike their counterparts for independent degrees of freedom. Therefore, we provide new insights into the resourcefulness of quantum correlations within the rarely discussed context of dependent degrees of freedom for light-matter links in quantum information applications. [1] F. Barkhausen et al. arXiv:2410.14290, (2024)

Keywords: Entanglement; Hybrid light-matter systems; Quasi-particles