Experimentally witnessing the initial correlation between an open quantum system and its environment
Chuan‐Feng Li, Jian‐Shun Tang, Yulong Li, Guang‐Can Guo · Physical Review A · 2011
System-environment correlations, which determine the (non-)Markovian character of a dynamical process, is an area of intense interest in the study of open quantum systems. We send photons emitted from a quantum dot sample into a $15$-m polarization-maintaining optical fiber to generate different system-environment correlated states and then witness the correlations by observing the growth of trace distances. This experimental scheme of correlation witnessing based on system-environment information flow can also be used for other similar systems.