Radiative Cooling of a Superconducting Resonator

Mingrui Xu, Xu Han, Chang-Ling Zou, Wei Fu, Yuntao Xu, Changchun Zhong, Liang Jiang, and Hong X. Tang
Phys. Rev. Lett. 124, 033602 – Published 23 January 2020
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Abstract

Cooling microwave resonators to near the quantum ground state, crucial for their operation in the quantum regime, is typically achieved by direct device refrigeration to a few tens of millikelvin. However, in quantum experiments that require high operation power such as microwave-to-optics quantum transduction, it is desirable to operate at higher temperatures with non-negligible environmental thermal excitations, where larger cooling power is available. In this Letter, we present a radiative cooling protocol to prepare a superconducting microwave mode near its quantum ground state in spite of warm environment temperatures for the resonator. In this proof-of-concept experiment, the mode occupancy of a 10 GHz superconducting resonator thermally anchored at 1.02 K is reduced to 0.44±0.05 from 1.56 by radiatively coupling to a 70 mK cold load. This radiative cooling scheme allows high-operation-power microwave experiments to work in the quantum regime, and opens possibilities for routing microwave quantum states to elevated temperatures.

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  • Received 22 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.124.033602

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsQuantum Information, Science & Technology

Authors & Affiliations

Mingrui Xu1, Xu Han1, Chang-Ling Zou1, Wei Fu1, Yuntao Xu1, Changchun Zhong2, Liang Jiang2, and Hong X. Tang1,*

  • 1Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520, USA
  • 2Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA

  • *hong.tang@yale.edu

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Vol. 124, Iss. 3 — 24 January 2020

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