In this case, "sub-kelvin" refers to temperatures below one degree kelvin (1K), which we then refer to as the "milli-kelvin" range.
Other types of low temperature experiments can go into the micro-kelvin, or even nano-kelvin, range. For our purposes, though, cryostats reaching about five or six milli-kelvin are sufficient for our work.
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In this case, "sub-kelvin" refers to temperatures below one degree kelvin (1K), which we then refer to as the "milli-kelvin" range.
Other types of low temperature experiments can go into the micro-kelvin, or even nano-kelvin, range. For our purposes, though, cryostats reaching about five or six milli-kelvin are sufficient for our work.