Thermalization of a flexible microwave stripline measured by a superconducting qubit

• URL: http://arxiv.org/abs/2410.01053v1
• Date: Tue, 1 Oct 2024 20:26:49 GMT
• Title: Thermalization of a flexible microwave stripline measured by a superconducting qubit
• Authors: Patrick Paluch, Martin Spiecker, Nicolas Gosling, Viktor Adam, Jakob Kammhuber, Kiefer Vermeulen, Daniël Bouman, Wolfgang Wernsdorfer, Ioan M. Pop,
• Abstract summary: Flexible microwave striplines offer the tantalyzing perspective of increasing the cabling density by an order of magnitude without thermally overloading the cryostat. We use a superconducting quantum circuit to test the thermalization of input flex cables with integrated $60,$dB of attenuation distributed at various temperature stages. We confirm that the qubit reaches an effective temperature of $26.4,$mK, close to the base temperature of the cryostat, practically the same as when using a conventional semi-rigid coaxial cable setup.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: With the demand for scalable cryogenic microwave circuitry continuously rising, recently developed flexible microwave striplines offer the tantalyzing perspective of increasing the cabling density by an order of magnitude without thermally overloading the cryostat. We use a superconducting quantum circuit to test the thermalization of input flex cables with integrated $60\,$dB of attenuation distributed at various temperature stages. From the measured decoherence rate of a superconducting fluxonium qubit, we estimate a residual population of the readout resonator below $3.5\cdot10^{-3}$ photons and we measure a $0.28\,$ms thermalization time for the flexible stripline attenuators. Furthermore, we confirm that the qubit reaches an effective temperature of $26.4\,$mK, close to the base temperature of the cryostat, practically the same as when using a conventional semi-rigid coaxial cable setup.

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