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Seamless High-Q Microwave Cavities for Multimode Circuit Quantum Electrodynamics.

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Researchers developed a novel seamless cavity for multimode circuit quantum electrodynamics (QED). This advancement enables enhanced quantum control and low dissipation in superconducting quantum systems.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science

Background:

  • Multimode cavity quantum electrodynamics (QED) is crucial for quantum information processing and quantum optics.
  • Superconducting circuits coupled to 3D microwave cavities are a leading platform for cavity QED due to long coherence times and strong interactions.

Purpose of the Study:

  • To realize a 3D multimode circuit QED system with improved performance.
  • To develop a novel fabrication method for superconducting microwave cavities enabling enhanced quantum control and reduced dissipation.

Main Methods:

  • Fabrication of a novel seamless 3D monolithic superconducting microwave cavity using a flute method.
  • Implementation of universal single-mode quantum control protocols across multiple cavity modes using a single drive line.

Main Results:

  • Achieved single photon lifetimes of 2 ms across 9 modes in the novel seamless cavity.
  • Demonstrated versatile quantum control protocols applicable to all cavity modes.
  • Developed a fabrication technique that reduces loss and allows control over mode spectrum and mode-qubit interaction.

Conclusions:

  • The developed flute method provides a template for engineering low-dissipation, multimode quantum systems.
  • This work is a significant step towards hardware-efficient quantum memories, processors, and exploring quantum many-body physics with photons.