[26p-E302-1~13] 3.8 Optical measurement, instrumentation, and sensor

[26p-E302-11] Magnetic-field-insensitive coherent-population-trapping resonances towards high stability miniature atomic clocks

〇Sota Kagami^1,2, Kenta Matsumoto^1,2, Takahiro Fujisaku^1,2, Akihiro Kirihara^1,2, Shinya Yanagimachi³, Takeshi Ikegami⁴, Atsuo Morinaga⁴ (1.NEC Corporation, 2.NEC-AIST Quantum Tech. Cooperative Research Lab., 3.AIST, 4.MMC)

Keywords:atomic clock, atomic physics, Quantum metrology

Coherent-population-trapping (CPT) resonance is a quantum interference phenomenon observed using a two-photon Lambda-type scheme in which the interference signal exhibits a high Q-factor at the microwave transition frequency between quantum states, such as the hyperfine transition of an alkali atom. Because of its availability as a simple optical setup, CPT is a key technology for miniature atomic clock devices.
In this presentation, we report experimental observation of magnetic-field-insensitive CPT resonances generated between the ground hyperfine levels on the D1 line of 133Cs using a two-photon Lambda schemes. The frequency shift of the CPT resonance excited by lin || lin polarizations is 50 times smaller than that of the conventional clock transition at a typical bias magnetic field for the clock operation. Thus, the CPT resonance on the D1 line of Cs atom excited by a simple lin || lin scheme will be one of the best candidates for frequency reference of miniature atomic clocks.