Atomic clock and quantum physics

Emerging quantum technologies based on ultracold matter and precise control of laser fields have revolutionized a new generation of optical atomic clocks with precision advancing to the 19th digit. This progress has benefited greatly from microscopic understandings of atomic interactions in the quantum regime and the capability of controlling optical phase coherence over many seconds. The unified front of precision metrology and quantum physics will allow us to explore complex quantum systems, test the fundamental laws of nature, search for new physics, and find unexpected applications.