A new progress in the scaling of semiconductor quantum dot-based qubits has been achieved b y researchers at the University of Science and Technology of China. Professor GUO Guoping with his co-workers, XIAO Ming, LI Haiou and CAO Gang, designed and fabricated a quantum processor with six quantum dots, and experimentally demonstrated quantum control of the Toffoli gate. This is the first realization of the Toffoli gate in a semiconductor quantum dot system, which motivates further research on larger scale semiconductor quantum processor. The report, titled “Controlled Quantum Operations of a Semiconductor Three-Qubit System,” was published in Physical Review Applied.