Optical-lattice-clock-network Technology for Gravitational Potential Sensing
Katsuya Oguri, Tomoya Akatsuka, Hiromitsu Imai +2 more
Optical lattice clocks have an ultrahigh frequency accuracy that exceeds that of cesium atomic clocks by a few orders of magnitude, enabling quantum sensing of gravitational potential equivalent to an altitude difference of only 1 cm on the Earth's surface.An optical-lattice-clock network, in which multiple optical lattice clocks are interconnected by optical fibers, is expected to become a new infrastructure, such as for a real-time sensing network of crustal movements with 1-cm-level accuracy.In this article, we introduce the elemental technologies comprising an optical-lattice-clock network.We also report on the construction of the ultrahigh-precision optical frequency transmission fiber link in the Tokyo metropolitan area and the experiment to evaluate its transmission stability.
NTT technical review•Jun 1, 2023•3 citations