“…However, despite recent progress [18][19][20][21][22][23][24][25] , it remains very challenging to cool nanostructures even below 10 mK. Due to reduced thermal coupling, these samples are extremely susceptible to heat leaks such as vibrations 25 , microwave radiation 26,27 , heat release 17 and electronic noise 20 . Metallic Coulomb blockade thermometers (CBTs) have been established as precise and reliable electronic thermometers 18,28,29 , operating down to 10 mK and slightly below 21,22,24,30 .…”