Phys.org June 25, 2019
Building on a recent theoretical scheme, an international team of researchers (Austria, Serbia) successfully demonstrated that entanglement verification can be undertaken in a surprisingly efficient way and in a very short time, thus making this task applicable also to large-scale quantum systems. To test their new method, they experimentally produced a quantum system composed of six entangled photons. The results show that only a few experimental runs suffice to confirm the presence of entanglement with extremely high confidence, up to 99.99 percent. After a quantum system has been generated in the laboratory, the scientists carefully choose specific quantum measurements which are then applied to the system. The results of these measurements lead to either confirming or denying the presence of entanglement…read more. TECHNICAL ARTICLEÂ
Artistic impression of entanglement detection. The stream of green and red lights represents the answers required by the protocol, thus revealing the presence of entanglement between photons. Credit: © Rolando Barry/University of Vienna