We present a transportable optical clock (TOC) with $^{87}$Sr. Its complete characterization against a stationary lattice clock resulted in a systematic uncertainty of ${7.4 \times 10^{-17}}$ which is currently limited by the statistics of the determination of the residual lattice light shift. The measurements confirm that the systematic uncertainty is reduceable to below the design goal of $1 \times 10^{-17}$. The instability of our TOC is $1.3 \times 10^{-15}/\sqrt{(τ/s)}$. Both, the systematic uncertainty and the instability are to our best knowledge currently the best achieved with any type of transportable clock. For autonomous operation the TOC is installed in an air-conditioned car-trailer. It is suitable for chronometric leveling with sub-meter resolution as well as intercontinental cross-linking of optical clocks, which is essential for a redefiniton of the SI second. In addition, the TOC will be used for high precision experiments for fundamental science that are commonly tied to precise frequency measurements and it is a first step to space borne optical clocks
Towards a compact transportable optical clock based on the octupole transition in 171Yb+
Key Laboratory of Time Reference and Applications, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences（中国科学院精密测量科学与技术创新学院时间频率应用重点实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Wuhan Institute of Quantum Technology（武汉量子技术研究院）
First GNSS-deployed optical clock for local time scale upgrade
Key Laboratory of Time Reference and Applications, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences（中国科学院精密测量科学与技术创新研究院时间基准与应用重点实验室）；National Institute of Metrology（中国计量科学研究院）；Beijing Satellite Navigation Center（北京卫星导航中心）；Wuhan Institute of Quantum Technology（武汉量子技术研究院）
High accuracy correction of blackbody radiation shift in an optical lattice clock
我们已经确定了黑体辐射在锶中的$5s^2$ $^1$ S $_0$ -- $5s5p$ $^3$ P $_0$时钟跃迁上引起的频移。以前它的不确定性限制了锶晶格钟的不确定性为$1\times10^{-16}$。现在，与黑体辐射位移校正相关的不确定性转化为室温下的$5\times 10^{-18}$相对频率不确定性。我们的评估是基于两个时钟状态的差分直流极化率的测量和使用此值和其他原子属性的实验数据的动态贡献的建模。
A Liquid-Nitrogen-Cooled Ca+ Ion Optical Clock with a Systematic Uncertainty of 4.4E-19
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences（中国科学院精密测量科学与技术创新研究院磁共振与原子分子物理国家重点实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Hefei National Laboratory, University of Science and Technology of China（中国科学技术大学合肥国家实验室）；Wuhan Institute of Quantum Technology（武汉量子技术研究院）
Modelling and Analysis of Mechanical and Thermal Response of an Ultrastable, Dual-Axis, Cubic Cavity for Terrestrial and Space Applications
Indian Institute of Technology Tirupati（印度理工学院蒂鲁帕蒂分校）；Center for Atomic, Molecular, and Optical Sciences and Technologies, Indian Institute of Technology Tirupati（印度理工学院蒂鲁帕蒂原子、分子与光学科学与技术中心）
