Quantifying entanglement in a 68-billion-dimensional quantum state space.

ABSTRACT: Entanglement is the powerful and enigmatic resource central to quantum information processing, which promises capabilities in computing, simulation, secure communication, and metrology beyond what is possible for classical devices. Exactly quantifying the entanglement of an unknown system requires completely determining its quantum state, a task which demands an intractable number of measurements even for modestly-sized systems. Here we demonstrate a method for rigorously quantifying high-dimensional entanglement from extremely limited data. We improve an entropic, quantitative entanglement witness to operate directly on compressed experimental data acquired via an adaptive, multilevel sampling procedure. Only 6,456 measurements are needed to certify an entanglement-of-formation of 7.11 ± 

SUBMITTER: Schneeloch J 

PROVIDER: S-EPMC6592913 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature