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We introduce junction readout, a new method for measuring superconducting qubits. This technique surpasses standard dispersive readout in speed and fidelity, offering improved performance for quantum computing hardware.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Measurement

Background:

  • Dispersive readout is the standard for superconducting qubit measurement.
  • It is limited by multiphoton processes, reducing speed and fidelity.
  • These limitations hinder progress in quantum gate operations.

Purpose of the Study:

  • To propose a novel, high-fidelity superconducting qubit readout method.
  • To overcome the limitations of standard dispersive readout.
  • To enhance the performance of quantum computing hardware.

Main Methods:

  • Introduced "junction readout" utilizing Josephson junction coupling.
  • Employed capacitive coupling to suppress Purcell decay.
  • Leveraged nonperturbative cross-Kerr interaction for measurement.

Main Results:

  • Junction readout demonstrates robustness against multiphoton processes.
  • Achieved fidelity exceeding 99.99% in under 30 ns.
  • Showcased superior performance compared to dispersive readout with similar hardware overhead.

Conclusions:

  • Junction readout offers a promising alternative for superconducting qubit measurement.
  • Enables faster and more accurate quantum information processing.
  • Suitable for implementation with current quantum computing hardware.