Phys.org May 23, 2018
Often it is difficult to tell whether a memory is storing quantum or merely classical information. The new test developed by an international team of researchers (Taiwan, Switzerland, Japan, Canada) uses a semiquantum framework that is very similar to that used in some tests of entanglement. By comparing the relative frequencies of the sent and received signals it is possible to estimate the time-like entanglement and therefore certify that a quantum memory can store quantum information. They showed that the new test is robust against noise and losses, and they expect that it should be possible to experimentally perform the test with current technology… read more. Open Access TECHNICAL ARTICLE
Although the inner workings of a quantum memory are hidden from view if a memory can be simulated by measurement and state preparation. Credit: Rosset et al. Published by the American Physical Society