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|September 18, 2023
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Researchers developed fast, high-fidelity quantum operations for superconducting circuits using a novel nonlinear converter. This method suppresses decoherence, achieving over 99.98% beamsplitter gate fidelity, advancing quantum computation and simulation.

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Area of Science:

  • Quantum Information Science
  • Superconducting Circuits
  • Quantum Computation and Simulation

Background:

  • Fast, high-fidelity operations between microwave resonators are crucial for bosonic quantum computation and simulation.
  • Coupling resonators via nonlinear converters and parametric processes is a promising approach.
  • Achieving both speed and fidelity is challenging due to parasitic processes and decoherence.

Purpose of the Study:

  • To demonstrate a method for achieving fast and high-fidelity operations in superconducting circuits.
  • To suppress unwanted nonlinear interactions and prevent converter-induced decoherence.
  • To engineer a highly-coherent beamsplitter and fast swaps between microwave cavities.

Main Methods:

  • Utilized a differentially-driven DC-SQUID as a nonlinear converter coupled to two high-Q microwave cavities.
  • Leveraged inbuilt symmetries of the converter Hamiltonian to suppress unwanted nonlinear interactions.
  • Carefully managed drive frequencies and environmental noise spectrum.
  • Characterized the beamsplitter in the cavities' joint single-photon subspace.
  • Detected and post-selected photon loss events.

Main Results:

  • Engineered a highly-coherent beamsplitter and fast (~100 ns) cavity swaps.
  • Operations were primarily limited by the intrinsic single-photon loss of the cavities.
  • Achieved a beamsplitter gate fidelity exceeding 99.98% through post-selection.

Conclusions:

  • Leveraging converter Hamiltonian symmetries is effective in preventing converter-induced decoherence.
  • The demonstrated approach significantly surpasses the current state-of-the-art in beamsplitter gate fidelity.
  • This work provides a pathway for robust and efficient quantum operations in superconducting circuits.