We analyze heat current fluctuations between electrons and phonons in a metal. In equilibrium we recover the standard result consistent with the fluctuation–dissipation theorem. Here we show that heat current noise at finite frequencies remains non-vanishing down to zero temperature. From the experimental point of view, it is a small effect and up to now elusive. We briefly discuss the impact of electron–phonon heat current fluctuations on calorimetry, particularly in the regime of single microwave-photon detection.
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We thank D. V. Averin for useful discussions. We acknowledge financial support from the Academy of Finland under Grants 312057 and 303677. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the European Research Council (ERC) programme and Marie Sklodowska-Curie actions (Grant agreements 742559 and 766025).
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Pekola, J.P., Karimi, B. Quantum Noise of Electron–Phonon Heat Current. J Low Temp Phys 191, 373–379 (2018). https://doi.org/10.1007/s10909-018-1854-y