Optical atomic clocks represent the state of the art in the frontier of modern measurement
science. In this article a detailed review on the development of optical atomic clocks that are …

We present a transportable optical clock (TOC) with Sr 87. Its complete characterization
against a stationary lattice clock resulted in a systematic uncertainty of 7.4× 10-17, which is …

We have measured the frequency of the extremely narrow 1 S-2 S two-photon transition in
atomic hydrogen using a remote cesium fountain clock with the help of a 920 km stabilized …

We report tests of local position invariance based on measurements of the ratio of the
ground state hyperfine frequencies of Cs 133 and Rb 87 in laser-cooled atomic fountain …

In quantum key distribution (QKD), the bit error rate is used to estimate the information
leakage and hence determines the amount of privacy amplification—making the final key …

High-dimensional quantum key distribution (HDQKD) offers the possibility of high secure-
key rate with high photon-information efficiency. We consider HDQKD based on the time …

We analyze the leading and higher-order quantum electrodynamic corrections to the energy
levels for a single electron bound in a Penning trap, including the Bethe logarithm correction …

We study the interplay of general relativity, the equivalence principle, and high-precision
experiments involving atomic transitions and g-factor measurements. In particular, we derive …

Considering the reference frequency dissemination requirements of the Square Kilometre
Array telescope (SKA) project, on the basis of the 1f–2f precision frequency synchronization …

A fiber-based, multiple access timing signal synchronization scheme is demonstrated. By
coupling out the bidirectional transmission signals, a highly stable timing signal can be …