Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 24: Verification and Benchmarking of Quantum Systems

QI 24.3: Talk

Thursday, March 21, 2024, 10:15–10:30, HFT-TA 441

Collective operations can exponentially enhance quantum state verification — •Ferran Riera Sabat, Jorge Miguel-Ramiro, and Wolfgang Dür — Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21a, 6020 Innsbruck, Austria

Maximally entangled states are a key resource in many quantum communication and computation tasks, and their certification is a crucial element to guarantee the desired functionality. Collective strategies for the efficient local verification of ensembles of Bell pairs that make use of initial information and noise transfer to a few copies prior to their measurement are introduced. In this way the number of entangled pairs that need to be measured and hence destroyed is significantly reduced as compared to previous, even optimal, approaches that operate on individual copies. Moreover, the remaining states are directly certified. We show that our tools can be extended to other problems and larger classes of multipartite states.

Keywords: Entanglement certification; Entanglement detection; Quantum protocols; Quantum information theory; Quantum networks