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Title: Radiative Cooling of a Superconducting Resonator

Journal Article · · Physical Review Letters

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. We report 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.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
National Science Foundation (NSF); Packard Foundation; US Air Force Office of Scientific Research (AFOSR); US Army Research Office (ARO); USDOE Office of Science (SC)
Grant/Contract Number:
SC0019406
OSTI ID:
1803801
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 124; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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