Cryogenic Thermalization Measurements of Microwave Attenuators
ORAL
Abstract
Dephasing due to residual thermal photons in readout cavities is a leading factor in limiting the coherence of superconducting qubits. This thermal noise originates from strong cavity drives and poor thermalization of microwave attenuators. It has been shown that cold attenuators could allow one to approach the qubit decoherence limits imposed by T1 [1]. We thus study the thermalization of cryo-attenuators by using a coaxial stub cavity over-coupled to a microwave input line for absolute temperature measurement. In particular, we look at the power dependence and the time constant for the temperature of a few attenuator designs, and discuss strategies for improvement.
[1] Z. Wang, et. al. Phys. Rev. Applied 11, 014031 (2019)
[1] Z. Wang, et. al. Phys. Rev. Applied 11, 014031 (2019)
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Presenters
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Aniket Maiti
Yale University
Authors
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Aniket Maiti
Yale University
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Vijay Jain
Yale University
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Luigi Frunzio
Yale University, Department of Applied Physics, Yale University, Departments of Applied Physics and Physics, Yale University
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Robert Schoelkopf
Yale University, Department of Applied Physics, Yale University, Departments of Applied Physics and Physics, Yale University