Realization of Fast All-Microwave Controlled-Z Gates with a Tunable Coupler

The development of high-fidelity two-qubit quantum gates is essential for digital quantum computing. Here,we propose and realize an all-microwave parametric controlled-Z(CZ) gates by coupling strength modulation in a superconducting Transmon qubit system with tunable couplers. After optimizing the design of the tunable coupler together with the control pulse numerically, we experimentally realized a 100 ns CZ gate with high fidelity of 99.38%±0.34% and the control error being 0.1%. We note that ...     

新型含芴基的富勒烯衍生物的合成

以2,7-二溴芴酮为起始原料,经Suzuki偶合、腙化和1,3-偶极环反应合成了3种新型的含芴基的富勒烯衍生物,其结构经UV-Vis,1H NMR,13C NMR,FT-IR和MALDI-TOF-MS表征。     

45kHz,2kV电光调制电路的设计与应用

根据差分相移量子密钥分发实验对高速电光调制电路的需求,利用固体开关技术和变压器隔离技术,设计出了重复频率为45kHz、输出脉冲电压达到2kV的电光调制电路,该电光调制电路由两部分组成,正负1kV高压脉冲产生电路,其中正1kV高压脉冲的上升沿为50.44ns,下降沿为44.6ns,负1kV高压脉冲下降沿为52.29ns,上升沿为50.44ns。普克尔盒调制电路与光路进行联调,光路的消光比达到23dB,完全满足了消光比为20dB的实验需求。