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Flux-tunable heat sink for quantum electric circuits.

M Partanen1, K Y Tan2, S Masuda2

  • 1QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076, Aalto, Finland. matti.t.partanen@aalto.fi.

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Summary
This summary is machine-generated.

Researchers developed a tunable heat sink for initializing superconducting qubits. This device efficiently dissipates photons in superconducting microwave circuits, crucial for quantum technology advancements.

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Area of Science:

  • Quantum Technology
  • Superconducting Circuits
  • Quantum Information Processing

Background:

  • Superconducting microwave circuits are vital for quantum information processing.
  • Fast and on-demand initialization of quantum states in these circuits is a significant challenge.

Purpose of the Study:

  • To experimentally implement a tunable heat sink for initializing superconducting qubits.
  • To engineer a device capable of efficient photon dissipation in superconducting circuits.

Main Methods:

  • The device utilizes two coupled resonators: one with a high quality factor and fixed frequency, the other with a low quality factor and tunable frequency.
  • On-chip resistors engineer the low quality factor, while superconducting quantum interference devices provide frequency tunability.
  • Resonance between the two coupled resonators enables efficient photon dissipation from the high-quality resonator.

Main Results:

  • The tunable heat sink demonstrated efficient photon dissipation when the coupled resonators were in resonance.
  • The loaded quality factor was successfully tuned from over 10^5 down to a few thousand at 10 GHz.
  • Experimental results showed good quantitative agreement with the developed theoretical model.

Conclusions:

  • The implemented tunable heat sink is a promising solution for the on-demand initialization of superconducting qubits.
  • This advancement addresses a key challenge in the practical application of superconducting quantum technologies.
  • The device's tunable nature and efficient dissipation capabilities offer significant potential for quantum information processing applications.