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High-contrast qubit interactions using multimode cavity QED.

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Summary
This summary is machine-generated.

We developed a new superconducting circuit architecture using multimode cavities for enhanced quantum technologies. This system improves qubit gate contrast and enables faster quantum simulations and photonic memory applications.

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Area of Science:

  • Quantum Information Science
  • Superconducting Circuits
  • Cavity Quantum Electrodynamics (QED)

Background:

  • Current cavity Quantum Electrodynamics (QED) architectures face limitations in qubit interaction contrast and gate speed.
  • Developing efficient quantum components like photonic memories and filters is crucial for advancing quantum computing.

Purpose of the Study:

  • To introduce and characterize a novel multimode cavity QED architecture for superconducting circuits.
  • To demonstrate enhanced qubit-qubit interactions and explore applications in quantum simulation and quantum memory.

Main Methods:

  • Utilized a three-mode cavity system coupling two superconducting qubits.
  • Spectroscopic analysis to observe multimode strong couplings and suppressed off-resonance interactions.
  • Investigated Landau-Zener transitions and quasi-adiabatic photon loading.
  • Implemented an adiabatic gate protocol for controlled-Z gates and Bell state generation.

Main Results:

  • Achieved multimode strong couplings up to 102 MHz.
  • Demonstrated suppressed off-resonance interactions of 10 kHz.
  • Successfully loaded single photons into the cavity in 25 ns.
  • Realized a controlled-Z gate in 95 ns with 94.7% Bell state fidelity, yielding a gate contrast of 1000.

Conclusions:

  • The proposed multimode cavity QED architecture significantly enhances qubit gate contrast and speed.
  • This architecture is suitable for building high-fidelity quantum gates, quantum simulations of photonic materials, and photonic quantum memories.