On-chip quantum confinement refrigeration overcoming electron-phonon heat leaks
2024-08-22 19:40
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Circuit-based quantum devices rely on keeping electrons at millikelvin temperatures. Improvedcoherence and sensitivity as well as discovering new physical phenomena motivate pursuing everlower electron temperatures, accessible using on-chip cooling techniques. Here we show that a twodimensional electron gas (2DEG), manipulated using gate voltages, works as an on-chip heat sinkonly limited by a fundamental phonon heat-leak. A single-shot 2DEG cooler can reduce the electrontemperature by a factor of two with a hold time up to a second. Integrating an array of such coolersto obtain continuous cooldown in will allow reaching down to microkelvin device temperatures.
