用于量子通信的增益开关半导体激光器研究进展

量子通信是当前量子信息领域的研究前沿和热点。增益开关半导体激光产生技术是一种实现脉冲激光产生的成熟方法,将其与注入锁定技术结合,可以满足量子通信应用对激光脉冲的需求。系统地介绍了增益开关半导体激光器的工作原理和注入锁定方案,以及其在量子密钥分发、量子随机数产生等方面的应用现状,着重从物理原理、实验方案和最新研究进展等方面进行阐述,并对其下一步的发展进行简要展望。     

稀土掺杂固态量子存储研究进展

量子存储对量子信息网络的实现至关重要,是当前量子信息领域的研究前沿和热点.在实现量子存储的多种媒质中,稀土掺杂固体材料由于具有较长的光学相干时间和较宽的光学吸收带宽而备受研究人员的关注.本文将系统地介绍稀土掺杂固态量子存储在材料体系、存储协议、应用范围等方面的重要进展,着重从物理机理、实验方法和新近成果等方面,阐述基于原子频梳协议的稀土掺杂固态量子存储方案,并对该方案的未来发展做简要展望.     

磺胺二甲嘧啶中4-氨基苯酚杂质的HPLC检测方法

建立了高效液相色谱测定磺胺二甲嘧啶药物中4-氨基苯酚杂质的分析方法,严格按照美国药典USP29<1225>、人用药品注册技术国际协调会议指导文件ICH Q2A和ICH Q2B对方法进行了验证.色谱柱采用Phenomenex LunaC18(4.6×250 mm,5 μm)反相色谱柱,流动相为V(Na2HPO4(8.95 g/L)):V(NaH4PO4(3.90 g/L)):V(甲醇)=3:3:2,检测波长为235nm.当4-氨基苯酚的浓度在0.05～1.00μg/mL时,色谱峰面积与浓度呈良好的线性关系,线性相关系数R=0.9993.方法的检出限为2.0 mg/kg,定量限为5.0 mg/k.方法的准确度、精密度和专属性均满足USP29<1225>、ICH Q2A和ICH Q2B的要求.将方法用于实际磺胺二甲嘧啶原料药检测,结果未检出含有4-氨基苯酚.本方法适合于磺胺二甲嘧啶及类似药物中4-氨基苯酚杂质的检测.     

Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture

We investigate the dephasing mechanisms induced by the charge noise and microwave heating effect acting on a graphene double quantum dot(DQD) capacitively coupled to a microwave resonator. The charge noise is obtained from DC transport current, and its contribution to dephasing is simultaneously determined by the amplitude response of the microwave resonator. A lowfrequency 1/f-type noise is demonstrated to be the dominant factor of the dephasing of graphene DQD. Furthermore, when the applied microwave power is larger than-90 d Bm, the dephasing rate of graphene DQD increases rapidly with the increase of microwave power, and fluctuates slightly with the applied microwave power smaller than-90 d Bm. Our results can be applied to suppress the impeditive influence on the dephasing of graphene-based devices associated with microwave input in the perspective investigations.