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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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Engineering superconducting qubits to reduce quasiparticles and charge noise
Xianchuang Pan1,2,3, Yuxuan Zhou1,2,3,4, Haolan Yuan1,2,3,4
1Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China.
Nature Communications
|November 23, 2022
Summary
Researchers developed a new strategy to reduce errors in superconducting qubits by controlling quasiparticle generation. This method enhances qubit stability and coherence for quantum computing applications.
Area of Science:
- Quantum computing
- Superconducting circuits
- Quantum information science
Background:
- Quasiparticles (broken Cooper pairs) degrade performance in superconducting qubits.
- Mitigating quasiparticle generation is crucial for scalable, high-coherence quantum devices.
Purpose of the Study:
- To experimentally demonstrate a quasiparticle mitigation strategy for superconducting qubits.
- To inhibit quasiparticle poisoning and improve qubit stability.
Main Methods:
- Downsizing the qubit and capping it with a metallic cover.
- Implementing quasiparticle traps and a flip-chip design.
- Shaping the electromagnetic environment to inhibit quasiparticle generation.
Main Results:
- Achieved a record low charge-parity switching rate (<1 Hz).
- Demonstrated improved stability against discrete charging events.
- Supported the hypothesis that Cooper pair breaking at the junction dominates quasiparticle generation.
Conclusions:
- The developed strategy effectively controls quasiparticle generation in superconducting qubits.
- This approach is compatible with scalable, high-coherence quantum device engineering.
- Offers a promising path towards fault-tolerant quantum computation.
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