University of California, Los Angeles, USA
Quantum color centers, such as nitrogen-vacancy impurities in diamond, are arising as a versatile tool to probe diverse aspects of transport and ordering in magnetic systems. I will review recent progress, both theoretical and experimental, in using color sensors as noninvasive probes of spin transport as well as pattern formation in magnetic materials, both old and new. While most of the work so far focussed on a single quantum impurity or a random ensemble thereof, one exciting prospect concerns correlated quantum dynamics of several quantum impurities, with collective dissipation effected by a nearby magnetic medium. This suggests novel avenues for distributed quantum sensing as well as quantum-information utility of conventional spintronic media.