2025-08-27
On August 27th, a joint scientific research team involving core members from Logical Qubit Technology published a paper titled "Topological prethermal strong zero modes on superconducting processors" in the globally top-tier academic journal Nature. They realized a novel "hot" topological edge state on the "Tianmu-2" hundred-qubit superconducting quantum chip, providing a new pathway for protecting fragile quantum information.
Symmetry-protected topological edge states are a novel exotic state in condensed matter physics and have garnered widespread attention in academia. They can effectively resist disturbances that satisfy specific symmetry noise and are considered useful for enhancing the reliability of quantum computing. However, topological edge states are highly sensitive to temperature and typically exist only in ideal environments at absolute zero. The new type of "hot" topological edge state achieved this time demonstrates that in disordered, finite-temperature quantum systems with thermal excitations, a "prethermalization" mechanism can effectively counteract thermal excitation disturbances, forming a more robust and long-lived topological edge state.
Superconducting Quantum Chip Performance Excellence
To achieve stable topological edge states, high-performance superconducting quantum chips are indispensable. This work was completed on the "Tianmu-2" hundred-qubit quantum chip, which was independently developed with the participation of core members from Logical Qubit Technology. This chip has a qubit count exceeding 100, with single-qubit gate fidelity reaching 99.95% and two-qubit gate fidelity reaching 99.5%. It is precisely these internationally advanced technical indicators that provide strong support for realizing complex quantum many-body states.
"Tianmu-2" Superconducting Quantum Chip
Throughout the experiment, the research team constructed a long chain with 100 particles on the "Tianmu-2" quantum chip and designed the coupling strengths between these particles in a dimerized pattern. The experiment showed that even with a large number of thermal excitations present in the long chain, the topological edge states at both ends of the chain still maintained a lifetime similar to that in the "zero-temperature" ground state! This robustness against thermal disturbances signifies the realization of a previously unprecedented new type of "hot" topological edge state.
Quantum Measurement and Control System Unparalleled
High-performance hundred-qubit superconducting quantum chips are the cornerstone for realizing quantum computing applications. How to precisely and synchronously control these qubits is also crucial, imposing stringent requirements on room-temperature quantum measurement and control systems. If the precision is insufficient, it would be impossible to observe thermal excitation dynamics or achieve the new type of "hot" topological edge state.
In this experiment, the quantum measurement and control system independently developed by Logical Qubit Technology played a significant role in synchronously and precisely controlling the hundred qubits. This hundred-qubit measurement and control system features high synchronization, high precision, and high efficiency. Its modular design is scalable to synchronous measurement and control of thousands of qubits, making it particularly suitable for future large-scale quantum computing applications. It is worth noting that, based on currently published data, this experiment is the first domestic demonstration of synchronous high-fidelity control of 100 qubits.
Quantum Measurement and Control System
Hangzhou Logical Qubit Technology Co., Ltd. was established in June 2022. The core team members come from the Zhejiang University Superconducting Quantum Computing Laboratory, which twice set world records for the number of globally entangled qubits in superconducting systems. In 2021, they released the 30-qubit "Mozhi-1" and "Tianmu-1" 3D packaged quantum chips. In 2022, they further achieved a quantum chip with over 100 qubits, contributing Chinese strength to the global advancement of quantum computing development!
Currently, the company's technology and products are centered on quantum chip design and fabrication. Leveraging deep expertise in the quantum chip field, the company has independently developed full-process technologies and products including quantum measurement and control systems, quantum computers, and quantum cloud platforms. In 2025, the company exceeded its revenue target.
Wang Zhen, founder and CEO of the company, stated that Logical Qubit Technology is committed to becoming a world-class quantum computing enterprise, completing the leap from physical qubits to logical qubits, and accelerating the arrival of the quantum computing era in a pragmatic manner.
