{"id":"https://openalex.org/T12004","display_name":"Advanced Frequency and Time Standards","description":"This cluster of papers focuses on advancements in optical atomic clock technology, including frequency metrology, stability evaluation, and quantum metrology. It also explores applications in geodesy and the study of fundamental constants.","keywords":[{"id":"https://openalex.org/keywords/atomic-clocks","display_name":"atomic clocks","score":0.6397},{"id":"https://openalex.org/keywords/frequency-stability","display_name":"frequency stability","score":0.2058},{"id":"https://openalex.org/keywords/frequency-standards","display_name":"frequency standards","score":0.7291},{"id":"https://openalex.org/keywords/optical-frequency-standard","display_name":"optical frequency standard","score":0.7538},{"id":"https://openalex.org/keywords/laser-frequency-stabilization","display_name":"laser frequency stabilization","score":0.4036},{"id":"https://openalex.org/keywords/frequency-stabilization","display_name":"frequency stabilization","score":0.2374},{"id":"https://openalex.org/keywords/hydrogen-maser","display_name":"hydrogen maser","score":0.7755},{"id":"https://openalex.org/keywords/cesium-clock","display_name":"cesium atomic clock","score":0.7886},{"id":"https://openalex.org/keywords/allan-deviation","display_name":"Allan deviation","score":0.3572},{"id":"https://openalex.org/keywords/time-and-frequency-standards","display_name":"time and frequency standards","score":0.8781},{"id":"https://openalex.org/keywords/time-and-frequency-metrology","display_name":"time and frequency metrology","score":0.8383},{"id":"https://openalex.org/keywords/optical-lattice-clock","display_name":"optical lattice clock","score":0.8107},{"id":"https://openalex.org/keywords/time-transfer","display_name":"time transfer","score":0.4319},{"id":"https://openalex.org/keywords/frequency-metrology","display_name":"frequency metrology","score":0.5773},{"id":"https://openalex.org/keywords/optical-clocks","display_name":"optical clocks","score":0.5807},{"id":"https://openalex.org/keywords/frequency-transfer","display_name":"frequency transfer","score":0.6621},{"id":"https://openalex.org/keywords/rubidium-clock","display_name":"rubidium atomic clock","score":0.6709},{"id":"https://openalex.org/keywords/optical-atomic-clocks","display_name":"optical atomic clocks","score":0.6885},{"id":"https://openalex.org/keywords/time-and-frequency-transfer","display_name":"time and frequency transfer","score":0.6663},{"id":"https://openalex.org/keywords/coherent-population-trapping","display_name":"coherent population trapping","score":0.2873},{"id":"https://openalex.org/keywords/coordinated-universal-time","display_name":"Coordinated Universal Time","score":0.593},{"id":"https://openalex.org/keywords/atomic-time","display_name":"atomic time","score":0.6873},{"id":"https://openalex.org/keywords/time-standards","display_name":"time standards","score":0.2329},{"id":"https://openalex.org/keywords/absolute-frequency-measurement","display_name":"absolute frequency measurement","score":0.6713},{"id":"https://openalex.org/keywords/primary-frequency-standard","display_name":"primary frequency standard","score":0.9459}],"legacy_keywords":"Optical Clocks; Atomic Clocks; Frequency Metrology; Lattice Clocks; Frequency Comparison; Stability Evaluation; Quantum Metrology; Frequency Transfer; Geodesy; Fundamental Constants","ids":{"openalex":"https://openalex.org/T12004","wikipedia":"https://en.wikipedia.org/wiki/Optical_clock"},"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"},"siblings":[{"id":"https://openalex.org/T10002","display_name":"Advanced Chemical Physics Studies"},{"id":"https://openalex.org/T10022","display_name":"Semiconductor Quantum Structures and Devices"},{"id":"https://openalex.org/T10049","display_name":"Magnetic properties of thin films"},{"id":"https://openalex.org/T10382","display_name":"Quantum and electron transport phenomena"},{"id":"https://openalex.org/T10425","display_name":"Cold Atom Physics and Bose-Einstein Condensates"},{"id":"https://openalex.org/T10490","display_name":"Orbital Angular Momentum in Optics"},{"id":"https://openalex.org/T10523","display_name":"Atomic and Molecular Physics"},{"id":"https://openalex.org/T10566","display_name":"Laser-Matter Interactions and Applications"},{"id":"https://openalex.org/T10622","display_name":"Quantum Mechanics and Applications"},{"id":"https://openalex.org/T10657","display_name":"Topological Materials and Phenomena"},{"id":"https://openalex.org/T10666","display_name":"Photonic Crystals and Applications"},{"id":"https://openalex.org/T10739","display_name":"Electromagnetic Scattering and Analysis"},{"id":"https://openalex.org/T10923","display_name":"Force Microscopy Techniques and Applications"},{"id":"https://openalex.org/T10988","display_name":"Advanced Fiber Laser Technologies"},{"id":"https://openalex.org/T11050","display_name":"Photorefractive and Nonlinear Optics"},{"id":"https://openalex.org/T11175","display_name":"Gyrotron and Vacuum Electronics Research"},{"id":"https://openalex.org/T11177","display_name":"Spectroscopy and Quantum Chemical Studies"},{"id":"https://openalex.org/T11262","display_name":"Quantum Mechanics and Non-Hermitian Physics"},{"id":"https://openalex.org/T11414","display_name":"Quantum optics and atomic interactions"},{"id":"https://openalex.org/T11449","display_name":"Mechanical and Optical Resonators"},{"id":"https://openalex.org/T11484","display_name":"Adaptive optics and wavefront sensing"},{"id":"https://openalex.org/T11603","display_name":"Dust and Plasma Wave Phenomena"},{"id":"https://openalex.org/T11666","display_name":"Color Science and Applications"},{"id":"https://openalex.org/T11683","display_name":"Quantum and Classical Electrodynamics"},{"id":"https://openalex.org/T11804","display_name":"Quantum many-body systems"},{"id":"https://openalex.org/T11853","display_name":"Semiconductor materials and interfaces"},{"id":"https://openalex.org/T11897","display_name":"Digital Holography and Microscopy"},{"id":"https://openalex.org/T11965","display_name":"Quantum, superfluid, helium dynamics"},{"id":"https://openalex.org/T11993","display_name":"Atomic and Subatomic Physics Research"},{"id":"https://openalex.org/T12077","display_name":"Vacuum and Plasma Arcs"},{"id":"https://openalex.org/T12220","display_name":"Quantum Electrodynamics and Casimir Effect"},{"id":"https://openalex.org/T12612","display_name":"Strong Light-Matter Interactions"},{"id":"https://openalex.org/T13493","display_name":"Optical and Acousto-Optic Technologies"},{"id":"https://openalex.org/T13531","display_name":"Surface and Thin Film Phenomena"},{"id":"https://openalex.org/T14311","display_name":"Electrical and Electromagnetic Research"},{"id":"https://openalex.org/T14363","display_name":"Optical properties and cooling technologies in crystalline materials"}],"works_count":33604,"cited_by_count":297563,"works_api_url":"https://api.openalex.org/works?filter=topics.id:T12004","updated_date":"2026-10-19T03:01:26","created_date":"2024-01-23T15:27:12"}