Quantum advantage by weak measurements

Lin-Ping Huai, Bo Li, Shi-Xian Qu, Heng Fan

Published 2013-05-28, updated 2014-03-17Version 4

Weak measurements may result in extra quantity of quantumness of correlations compared with standard projective measurement on a bipartite quantum state. We show that the quantumness of correlations by weak measurements can be consumed for information encoding which is only accessible by coherent quantum interactions. Then it can be considered as a resource for quantum information processing and can quantify this quantum advantage. We conclude that weak measurements can create more valuable quantum correlation.