An understanding of heat transport is relevant to developing efficient strategies for thermal
management in areas of study such as microelectronics, as well as for fundamental science
purposes. However, the measurement of temperatures in nanostructured environments and
in cryogenic conditions remains a challenging task, requiring both high sensitivity and
noninvasive approaches. Here, we present a portable nanothermometer based on a
molecular two-level quantum system that operates in the (3–20)-K temperature range, with …