Xueren Huang

Hertz-level measurement of the Ca-40(+) 4s S-2(1/2)-3d D-2(5/2) clock transition frequency with respect to the SI second through the Global Positioning System

We have measured the absolute frequency of a clock transition at the 10(-15) level with a single, trapped, laser-cooled Ca-40(+) ion in a miniature Paul trap. In our measurement, an optical frequency comb is referenced to a hydrogen maser, which is calibrated to the SI second through the Global Positioning System (GPS). By analyzing the experimental data obtained within 32 days of a total averaging time > 2 x 10(6) s, the absolute frequency of the Ca-40(+) 4s S-2(1/2)-3d D-2(5/2) clock transition is measured as 411 042 129 776 393.0 (1.6) Hz with a fractional uncertainty of 3.9 x 10(-15).

A compact, transportable single-ion optical clock with 7.8 × 10 −17 systematic uncertainty

A transportable optical clock refer to the

Investigation of several parameters in the design of YVO4 polarizing prism

4s^2S_{1/2}-3d^2D_{5/2}

The effect of an electric field on the nonlinear response of InAs/GaAs quantum dots

electric quadrupole transition at 729 nm of single

Evaluation of blackbody radiation shift with temperature-associated fractional uncertainty at 10−18 level for 40Ca+ ion optical clock

^{40}Ca^+

Evaluation of the systematic shifts of a single-Ca-40(+)-ion frequency standard

trapped in mini Paul trap has been developed. The physical system of

Stabilization of the 397 nm and 866 nm external cavity diode lasers for cooling a single calcium ion

^{40}Ca^+

A 729 nm laser with ultra-narrow linewidth for probing 4S1/2–3D5/2 clock transition of 40Ca+

optical clock is re-engineered from a bulky and complex setup to an integration of two subsystems: a compact single ion unit including ion trapping and detection modules, and a compact laser unit including laser sources, beam distributor and frequency reference modules. Apart from the electronics, the whole equipment has been constructed within a volume of 0.54

The refractive nonlinearities of InAs/GaAs quantum dots above-bandgap energy

m^3

Temperature dependence of hole spin relaxation in ultrathin InAs monolayers

. The systematic fractional uncertainty has been evaluated to be