There is no fundamental limiting low temperature of dilution refrigerators.
Cooling is accomplished using a dilution refrigerator.
This precooling is often provided by the mixing chamber of a dilution refrigerator or a paramagnetic salt.
In the traditional design of a dilution refrigerator (Figure 1a) a liquid helium bath is used.
These techniques can be used to make cryocoolers, or as components of lower-temperature cryostats such as dilution refrigerators.
I don't see us all having dilution refrigerators on our desks (or in our phones).
The dilution refrigerator allows cooling the apparatus down to 100mK or less which makes data taking 400 times faster.
The fountain effect is used to drive the circulation of He in dilution refrigerators.
He is known as well for being the inventor of the dilution refrigerator, a cryogenic device that uses liquid helium.
This makes possible the small-scale use of the dilution refrigerator, which is capable of reaching temperatures of a few millikelvins.