Quantum bath suppression in a superconducting circuit by immersion cooling

• URL: http://arxiv.org/abs/2210.03816v1
• Date: Fri, 7 Oct 2022 20:57:47 GMT
• Title: Quantum bath suppression in a superconducting circuit by immersion cooling
• Authors: M. Lucas, A. V. Danilov, L. V. Levitin, A. Jayaraman, A. J. Casey, L. Faoro, A. Ya. Tzalenchuk, S. E. Kubatkin, J. Saunders and S. E. de Graaf
• Abstract summary: Most superconducting devices plateau out at $Tapprox 50$ mK -- far above the refrigerator base temperature. We demonstrate how to remove this thermal constraint by operating a circuit immersed in liquid $3$He. We see a continuous change in measured physical quantities down to previously unexplored sub-mK temperatures.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum circuits interact with the environment via several temperature-dependent degrees of freedom. Yet, multiple experiments to-date have shown that most properties of superconducting devices appear to plateau out at $T\approx 50$ mK -- far above the refrigerator base temperature. This is for example reflected in the thermal state population of qubits, in excess numbers of quasiparticles, and polarisation of surface spins -- factors contributing to reduced coherence. We demonstrate how to remove this thermal constraint by operating a circuit immersed in liquid $^3$He. This allows to efficiently cool the decohering environment of a superconducting resonator, and we see a continuous change in measured physical quantities down to previously unexplored sub-mK temperatures. The $^3$He acts as a heat sink which increases the energy relaxation rate of the quantum bath coupled to the circuit a thousand times, yet the suppressed bath does not introduce additional circuit losses or noise. Such quantum bath suppression can reduce decoherence in quantum circuits and opens a route for both thermal and coherence management in quantum processors.

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