Abstract We present a high-resolution optical spectropolarimetric observation of the red supergiant VY CMa. The spectrum CMa contains numerous emission features that are mainly due to molecular bands TiO, ScO, and VO. In addition, lines Ba ii , Ca i Na K i, Rb identified in spectrum. Our shows all exhibit very large abrupt linear polarization reduction, i.e., depolarization, across band heads u...

The opportunity to build quantum technologies operating with elementary systems more than two levels is now increasingly being examined, not least because of the availability such in laboratory. It therefore essential understand how these single initially highly non-classical states decohere on different time scales due their coupling environment. In this work, we consider depolarization, both ...