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Updated: May 18, 2026
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Initialization by measurement of a superconducting quantum bit circuit
D Ristè1, J G van Leeuwen, H-S Ku
1Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands.
Physical Review Letters
|September 26, 2012
Summary
We demonstrate a new method for initializing transmon qubits using joint measurement, achieving 98.8% fidelity. This technique outperforms passive initialization for quantum computing applications.
Area of Science:
- Quantum Computing
- Circuit Quantum Electrodynamics
Background:
- Initialization is crucial for quantum computation.
- Transmon qubits are a leading superconducting qubit modality.
Purpose of the Study:
- To demonstrate a novel initialization protocol for transmon qubits.
- To achieve high-fidelity ground state preparation.
Main Methods:
- Utilizing joint measurement of two transmon qubits in 3D circuit quantum electrodynamics.
- Employing homodyne detection with Josephson parametric amplification.
- Implementing measurement and postselection of a steady-state mixture.
Main Results:
- Nondestructive discrimination between ground and excited states with 98.1% fidelity.
- Achieving 98.8% fidelity to the ground state after postselection.
- Demonstrating superior performance compared to passive initialization methods.
Conclusions:
- Joint measurement offers a high-fidelity initialization strategy for transmon qubits.
- This method enhances the efficiency and accuracy of preparing quantum states.
- The demonstrated technique is a significant step towards scalable quantum computing.
