Xiaoyang Guo

In the relentless pursuit of quantum computational advantage, we present a significant advancement with the development of Zuchongzhi 3.0. This superconducting quantum computer prototype, comprising 105 qubits, achieves high operational fidelities, with single-qubit gates, two-qubit gates, and readout fidelity at 99.90%, 99.62%, and 99.13%, respectively. Our experiments with an 83-qubit, 32-cycle random circuit sampling on the Zuchongzhi 3.0 highlight its superior performance, achieving 1×10^{6} samples in just a few hundred seconds. This task is estimated to be infeasible on the most powerful classical supercomputers, Frontier, which would require approximately 5.9×10^{9} yr to replicate the task. This leap in processing power places the classical simulation cost 6 orders of magnitude beyond Google's SYC-67 and SYC-70 experiments [Morvan et al., Nature 634, 328 (2024)10.1038/s41586-024-07998-6], firmly establishing a new benchmark in quantum computational advantage. Our work not only advances the frontiers of quantum computing but also lays the groundwork for a new era where quantum processors play an essential role in tackling sophisticated real-world challenges.

At temperatures greater than 70 °C, the introduction of air in the slurry preparation process in slag hydration of solidified stone produces cracking and thermal stresses. In the study, slag cementing slurries at 90 °C were used to join brucite fibers. The mechanical performance, toughening mechanism, and microstructural changes were studied using tensile tests, XRD, TGA, SEM, IR, and triaxial tests. After curing for 14 and 28 days, the compressive and tensile strengths of 6 wt% brucite fiber-reinforced slag increased by 69.08 and 45.98% and 73.58 and 69.08%, respectively, while the elastic modulus decreased 8.4% compared to the control samples The brucite fibers were randomly distributed in the slag cementing slurries, resulting in a toughened material via energy dissipation caused by bridging peel and pulling-out. This result provides theoretical background to solve strength attenuation and cracking phenomenon at high temperature in solidified slag stones.