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Updated: Jun 5, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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
|January 15, 2011
Summary
We discovered a new superconducting qubit readout method using Jaynes-Cummings nonlinearity. This technique achieves high single-shot fidelity, crucial for advancing quantum computing.
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.
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