A review of a cold-atom clock based on coherent population trapping that highlights recent progress will be presented. Improvements in the coherence of the interrogation spectrum have resulted in the generation of dark states in the cold Rb atoms with essentially 100 % transmission – evidence that decoherence in this system is negligible. This improvement in coherence has resulted in improved short-term stability at the level of 1.5E-11 fractional frequency stability for a one second integration period. In combination with improved interrogation schemes, the improved spectrum has also resulted in dramatically smaller light shifts and improved long-term frequency stability – with the clock averaging down to the level of 1E-13 fractional frequency stability on time scales of over 10,000 seconds.
Elizabeth A. Donley, Xiaochi Liu, Eugene N. Ivanov, Valeriy I. Yudin, and John E. Kitching, "Cold-atoms: A clean system for clocks based on coherent population trapping (Conference Presentation)," Proc. SPIE 10119, Slow Light, Fast Light, and Opto-Atomic Precision Metrology X, 1011902 (Presented at SPIE OPTO: January 30, 2017; Published: 28 April 2017); https://doi.org/10.1117/12.2261162.5397361516001.
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