A research team solves the contradiction between speed and fidelity in superconducting quantum computing

Among them, the experimental verification work has been completed on China's independent superconducting quantum computer "Benyuan Wukong", and the relevant results have been recently published in the international journal "Physical Review Letters".

It is reported that quantum computers cannot complete complex calculations without the basic operation of "quantum gates". Stable and reliable quantum computing requires quantum gates to have both ultrafast operation speed and ultra-high computational fidelity. But for a long time, there has been an irreconcilable contradiction between these two points: the faster the quantum gate operation speed, the more obvious the problems of hardware waveform distortion, timing deviation, etc., which will lead to a significant decrease in accuracy; If the speed is slowed down to ensure accuracy, it will also drag down the overall operational efficiency of quantum computers, which is a key bottleneck restricting the development of quantum computers.

In response to this issue, the research team has innovatively proposed the "Parameter Space Extended Controlled Phase Gate (PSE-CZ)" scheme. Dr. Yang Xiaoyan, a quantum measurement and control scientist at Benyuan, introduced to the China Science Journal that this scheme adds an "adjustment knob" to the system by splitting the detuning in the middle region of the pulse into two independently adjustable parameters without extending the pulse time. By relying on this innovative mechanism, the system can synchronously correct both leakage and phase errors, achieving a balance between speed and high fidelity.

Based on the "Origin Wukong" superconducting quantum computer, the team selected 20 pairs of two bit quantum gates for testing. The results show that the PSE-CZ scheme can effectively reduce the coherence error caused by short-term distortion, making the quantum gate performance closer to the decoherence limit. Even under extremely short gate length conditions of 30-40 nanoseconds, PSE-CZ maintains better stability performance than traditional CZ gates.

It is reported that this scheme is not only suitable for superconducting quantum computing systems, but can also be extended to various quantum computing platforms such as ion traps and solid-state spin, which is expected to provide new methods for achieving faster and higher fidelity quantum logic operations.

Benyuan Quantum is the first quantum computing company in China, focusing on the research and development of full stack quantum computers. It has initially built a "three hard and three soft" quantum computing technology system with a core of quantum chip system, quantum computing measurement and control system, environmental support system, quantum operating system and software, quantum computing cloud platform, and quantum computing application software. Its independently developed "Origin Wukong" series superconducting quantum computers have provided stable quantum computing services to 192 countries and regions worldwide, with a cumulative remote access of over 52 million people and completion of over 1 million computing tasks.

quote:A research team solves the contradiction between speed and fidelity in superconducting quantum computing - University of Science and Technology of China【 Reference time: August 12, 2026 】