Real-time milli-Kelvin thermometry in a semiconductor qubit architecture

Abstract

We report local time-resolved thermometry in a silicon nanowire quantum dot device designed to host a linear array of spin qubits. Using two alternative measurement schemes based on rf reflectometry, we are able to probe either local electron or phonon temperatures with $\mu$s-scale time resolution and a noise equivalent temperature of $3$ $mK/\sqrt{\mathrm{Hz}}$. Following the application of short microwave pulses, causing local periodic heating, time-dependent thermometry can track the dynamics of thermal excitation and relaxation, revealing clearly different characteristic time scales. This work opens important prospects to investigate the out-of-equilibrium thermal properties of semiconductor quantum electronic devices operating at very low temperature. In particular, it may provide a powerful handle to understand heating effects recently observed in semiconductor spin-qubit systems.

7 pages 4 figures (supp. mat. 6 pages and 5 figures)

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Cited by in corpus (3)

• Thermometry Based on a Superconducting Qubit
• Measuring pulse heating in Si quantum dots with individual two-level fluctuators
• Steady-state heat engines driven by finite reservoirs