Fast Electron Thermometry for Ultrasensitive Calorimetric Detection

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We demonstrate radio-frequency thermometry on a micrometer-sized metallic island below 100 mK. Our device is based on a normal-metal–insulator–superconductor tunnel junction coupled to a resonator with transmission readout. In the first generation of the device, we achieve 90  μK/√Hz noise-equivalent temperature with 10 MHz bandwidth. We measure the thermal relaxation time of the electron gas in the island, which we find to be of the order of 100  μs. Such a calorimetric detector, upon optimization, can be seamlessly integrated into superconducting circuits, with immediate applications in quantum-thermodynamics experiments down to single quanta of energy.


Original languageEnglish
Article number014007
Pages (from-to)1-7
JournalPhysical Review Applied
Issue number1
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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