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The Rydberg-based microwave detection is an all-optical technology via using strong coherent interaction between Rydberg atoms and microwave field. Different from the traditional microwave meter, the Rydberg atomic sensing is a new-type microwave detector that transfers the microwave into a coherent optical spectrum, and attracts the rising interests due to its high sensibility. For this kind of sensor, the coherent effect induced by the coupling of atoms with microwave plays the key role, and the underline decoherence may decreases the sensitivity. In this work, we experimentally demonstrate a multi-level Rydberg atomic scheme with optimized quantum coherence that enhance both of the bandwidth and sensitivity for 4GHz microwave sensing. Using Optical pumping at D1 line, we show the enhanced quantum coherence of Rydberg electromagnetically induced transparency (EIT) and microwave induced Autler-Townes（AT） splitting in EIT Windows. Based on the enhanced EIT-AT spectrum, the enhanced sensitivity at 3.4GHz with 0.3GHz bandwidth can be realized. The experimental results show that in the stepped Rydberg EIT system, the spectral width of EIT and microwave field EIT-AT can be narrowed by OP, so the sensitivity of microwave electric field measurement can be improved. After optimizing the EIT amplitude and adding single-frequency microwaves, the sensitivity of the microwave electric field measurement observed by the A-T splitting interval was improved by 1.3 times. This work provides a reference for the application of atomic microwave detection.
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Keywords:
- quantum coherence effect /
- Rydberg /
- Microwave measurements /
- Optical pumping
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