Fast Quantum Control of Semiconductor Qubit

The gate-defined semiconductor quantum dot system, which can be manipulated electrically and fabricated using modern microelectronic technology, is considered as an ideal platform for quantum computation. The efficiency of quantum computation depends on the speed of gate operation. And charge qubit has quick operational speed and strong inter-qubit strength but with technical challenges. In this talk, I will introduce our experiments on ultrafast quantum control in semiconductor charge qubits including ultrafast universal quantum control of single charge qubit using LZS(Landau-Zener-Stückelberg) interference, conditional rotation of two strongly coupled qubits and static Toffoli gate of three qubits. Furthermore, to find a balance between coherence and operation speed we experimentally demonstrated tunable hybrid qubit in GaAs quantum dots system. Finally, we also focuse on cryogenic electronics for quantum computing, we have measured and modeled standard process CMOS at 77K, 4.2K and 300mK. CryoCMOS can be applied to the readout and control system of quantum chips in the future.