Deployed optical clocks will improve positioning for navigational autonomy, provide remote
time standards for geophysical monitoring and distributed coherent sensing, allow time …

This paper outlines the roadmap towards the redefinition of the second, which was recently
updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of …

Kerr-induced synchronization (KIS) provides a key tool for the control and stabilization of a
dissipative Kerr soliton (DKS) frequency comb, enabled by the capture of a comb tooth by an …

Optical frequency combs have enabled unique advantages in broadband, high-resolution
spectroscopy and precision interferometry. However, quantum mechanics ultimately limits …

The large-scale clock network is the key ingredient to obtain high precision in many
scenarios, from fundamental research to cutting-edge applications. The advantage of the …

Dual-comb spectroscopy (DCS) provides broadband, high-resolution, high-sensitivity
amplitude and phase spectra within a short measurement time, thus holding promises for …

Optical frequency combs have emerged as a new generation of metrological tools, driving
advancements in various fields such as free-space two-way time–frequency transfer, low …

With the demonstration of quantum-limited optical time transfer capable of tolerating the
losses associated with long ground-to-space links, two future applications of free-space time …

The Black Hole Explorer (BHEX) mission will enable the study of the fine photon ring
structure, aiming to reveal the clear universal signatures of multiple photon orbits and true …

The next generation of space-based networks for communications, sensing, and navigation
will contain optical clocks embedded within satellites. To fully realize the capabilities of such …