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High Stability Comparison of Atomic Fountains using two Different Cryogenic Oscillators
Summary
This study compares two atomic clock systems using cryogenic sapphire oscillators. Results show cryocooled oscillators can replace helium-refilled ones for precise timekeeping.
Area of Science:
- Physics
- Metrology
- Quantum Technology
Background:
- Atomic clocks are crucial for timekeeping and scientific research.
- Cryogenic oscillators offer enhanced stability for frequency standards.
- Current systems often rely on helium-refilled cryogenic oscillators.
Purpose of the Study:
- To characterize and compare two atomic clock interrogation systems.
- To evaluate the performance of cryogenic sapphire oscillators as references.
- To assess the potential of cryocooled oscillators to replace helium-refilled ones.
Main Methods:
- Simultaneous operation of two atomic clock interrogation systems.
- Utilizing two different cryogenic sapphire oscillators.
- Employing two accurate fountain clock frequency standards.
- Operating systems at the quantum projection noise frequency limit.
Main Results:
- Detailed characterization of the two atomic clock interrogation systems.
- Comparison of the two fountain clock frequency standards.
- Achieved frequency comparison stability down to a few 10^-16 over 28 days.
- Demonstrated the potential of cryocooled oscillators.
Conclusions:
- Cryocooled oscillators show promise for replacing helium-refilled cryogenic oscillators.
- The characterized systems operate at the quantum projection noise limit.
- This work advances the development of highly accurate atomic clocks.
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