Authors: Jiaxuan Zhang, Zhao-Yun Chen, Yun-Jie Wang, Bin-Han Lu, Hai-Feng Zhang, Jia-Ning Li, Peng Duan, Yu-Chun Wu, Guo-Ping Guo

Published on: May 15, 2024

Impact Score: 7.4

Arxiv code: Arxiv:2405.09035

Summary

• What is new: The experimental implementation of a universal logical gate set, including logical CNOT and arbitrary single-qubit rotation gates, on distance-2 surface codes using the superconducting processor Wukong.
• Why this is important: Achieving fault-tolerant quantum computing (FTQC) with a universal gate set on logical qubits in superconducting systems, which previously lacked two-qubit gate operations on surface code logical qubits.
• What the research proposes: Using the superconducting quantum processor Wukong to execute logical CNOT gates and arbitrary single-qubit rotation gates via gate teleportation on encoded logical qubits, surpassing the fidelity of physical state operations.
• Results: Successful encoding of logical qubits, execution of transversal CNOT gates, and fault-tolerant preparation of logical Bell states with higher fidelities than their physical counterparts. Evaluation of all logical gates showed improved fidelity demonstrated through logical Pauli transfer matrices.

Technical Details

Technological frameworks used: nan

Models used: Distance-2 surface codes, logical Pauli transfer matrices.

Data used: Encoded logical qubit states, physical and logical Bell states.

Potential Impact

Quantum computing industries, technology firms investing in quantum technologies, cybersecurity sectors relying on quantum-safe encryption.

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