SAMOP 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

QI: Fachverband Quanteninformation

QI 11: Quantum Entanglement I

QI 11.1: Hauptvortrag

Dienstag, 7. März 2023, 11:00–11:30, B305

Characterisation of multipartite entanglement beyond the single-copy paradigm — •Nicolai Friis — Institute of Atomic and Subatomic Physics - Atominstitut, TU Wien, Vienna, Austria

Scenarios with multiple parties such as one would imagine will be encountered in future large-scale quantum networks present complex challenges for the characterisation of entanglement. One of the most basic insights in the theory of multipartite entanglement is the fact that some mixed states can feature entanglement across every possible bipartition of a multipartite system, yet can be biseparable, i.e., can be produced as mixtures of partition-separable states. To distinguish biseparable states from those states that genuinely cannot be produced from mixing partition-separable states, the term genuine multipartite entanglement was coined. The premise for this distinction is that only a single copy of the state is distributed and locally acted upon. However, advances in quantum technologies prompt the question of how this picture changes when multiple copies of the same state become locally accessible. In this talk I will discuss recent work [Yamasaki et al., Quantum 6, 695 (2022), Palazuelos & de Vicente, Quantum 6, 735, (2022)] which demonstrates that multiple copies unlock genuine multipartite entanglement from partition-separable states, even from undistillable ensembles. These results show that a modern theory of entanglement in multipartite systems, which includes the potential to locally process multiple copies of distributed quantum states, exhibits a rich structure that goes beyond the convex structure of single copies.