Claude Cohen-Tannoudji ,is a guest reseacher of Quantum Frequency Standards Lab. of NTSC.

Claude Cohen-Tannoudji (born 1933) is a French physicist and Nobel Laureate, director of the Laboratoire Kastler Brossel of the Ecole Normale Superieure in Paris.

After four years of study in Paris at the Ecole Normale Superieure, he passes the physical aggregation then becomes a doctor of state in 1962 with a thesis on the theory of optical pumping. He then continued a career at CNRS and the University before being elected in 1973, the College de France. He became a member of the Academy of Sciences in 1981 and several foreign academies and received numerous awards throughout his career, especially the gold medal of the CNRS in 1996. In 1997, he shared the Nobel Prize with Steven Chu and William D. Phillips for "the development of methods to cool and trap atoms with laser beams”. Claude Cohen-Tannoudji continues his research at the Laboratoire Kastler Brossel.