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High-fidelity readout in circuit quantum electrodynamics using the Jaynes-Cummings nonlinearity.

M D Reed1, L DiCarlo, B R Johnson

  • 1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA.

Physical Review Letters
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We discovered a new superconducting qubit readout method using Jaynes-Cummings nonlinearity. This technique achieves high single-shot fidelity, crucial for advancing quantum computing.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting qubits are promising for quantum computation.
  • Efficient and high-fidelity qubit readout is essential for scalable quantum processors.
  • Existing readout schemes face challenges in speed and fidelity.

Purpose of the Study:

  • To develop a novel qubit readout scheme for superconducting transmon qubits.
  • To leverage the Jaynes-Cummings nonlinearity for improved measurement fidelity.
  • To demonstrate a robust and simple protocol for single-shot qubit state determination.

Main Methods:

  • Utilized a superconducting cavity coupled to transmon qubits.
  • Exploited the Jaynes-Cummings nonlinearity in the strongly driven dispersive regime.
  • Identified a critical power-dependent high-transmission 'bright' state sensitive to the initial qubit state.

Main Results:

  • Achieved 87% single-shot readout fidelity with a conventional setup.
  • Demonstrated at least 61% fidelity for joint correlations of three qubits.
  • Observed an unexpected 'bright' state onset critical to qubit state.

Conclusions:

  • The demonstrated qubit readout scheme is simple, robust, and effective.
  • This method offers a promising pathway for high-fidelity measurements in superconducting quantum systems.
  • The findings pave the way for improved scalability in quantum computing architectures.