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TT: Fachverband Tiefe Temperaturen
TT 8: Measurement Technology and Cryogenics
TT 8.10: Vortrag
Montag, 17. März 2025, 17:30–17:45, H32
Fast, accurate and local temperature control using qubits — •Riya Baruah1, Pedro Portugal1, Joachim Wabnig2, and Christian Flindt1,3 — 1Department of Applied Physics, Aalto University, 00076 Aalto, Finland — 2Nokia Bell Labs, Cambridge, United Kingdom — 3RIKEN Center for Quantum Computing, Wakoshi, Saitama 351-0198, Japan
Many quantum technologies operate in the subkelvin regime. It is therefore desirable to develop practical tools and methods for the precise control of the temperature in nanoscale quantum systems. Here, we present a proposal for fast, accurate, and local temperature control using qubits, which regulate the flow of heat between a quantum system and its thermal environment [1,2]. The qubits are kept in a thermal state with a temperature that is controlled in an interplay between work done on the qubits by changing their energy splittings and the flow of heat between the qubits and the environment. Using only a few qubits, it is possible to control the thermal environment of another quantum system, which can be heated or cooled by the qubits. As an example, we show how a quantum system at subkelvin temperatures can be significantly and accurately cooled on a nanosecond timescale.
[1] P.Portugal, F.Brange, C.Flindt, Phys. Rev. Res. 4, 043112 (2022).
[2] R.Baruah, P.Portugal, J.Wabnig, C.Flindt, arXiv:2410.04796 (2024).
Keywords: Open quantum systems; Lindblad master equations; Temperature pulses; Cooling; Qubits