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Updated: May 29, 2025
10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
10.8K
Long-Range ZZ Interaction via Resonator-Induced Phase in Superconducting Qubits
Xiang Deng1,2, Wen Zheng1,2, Xudong Liao1,2
1Nanjing University, National Laboratory of Solid State Microstructures, School of Physics, Nanjing 210093, China.
Physical Review Letters
|February 6, 2025
Summary
We developed a new superconducting quantum computing method to improve qubit connectivity. This technique enables long-range interactions, crucial for building scalable quantum processors and achieving fault-tolerant quantum computing.
Area of Science:
- Quantum Information Science
- Superconducting Quantum Computing
- Quantum Engineering
Background:
- Superconducting quantum computing is a leading approach for quantum advantage.
- Limited qubit connectivity (nearest-neighbor coupling) presents a major challenge.
- This limitation leads to significant coding overhead in quantum processors.
Purpose of the Study:
- To propose a novel coupling scheme to extend the interaction distance between superconducting qubits.
- To enhance qubit connectivity for scalable quantum computing.
- To facilitate the implementation of quantum error correction codes.
Main Methods:
- A multimode coupling scheme using three resonators and two microwave drives.
- Utilizing a resonator-induced phase gate for extending ZZ interaction.
- Optimizing driving pulses to minimize residual photons.
Main Results:
- Demonstrated a controlled-Z (CZ) gate fidelity exceeding 99.9% within 160 ns.
- Achieved high fidelity CZ gates over extended distances (submeters).
- Reduced residual photons to nearly 10^-3 within 100 ns by optimizing pulses.
Conclusions:
- The proposed scheme significantly enhances qubit connectivity in superconducting processors.
- This advancement is crucial for scalable integration and modularization of quantum hardware.
- Enables implementation of high-connectivity quantum error correction codes for fault-tolerant quantum computing.
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