Autobalanced Ramsey Spectroscopy.

Area of Science:

• Atomic, Molecular, and Optical (AMO) Physics
• Metrology and Precision Measurement
• Quantum Information Science

Background:

• High-precision atomic clocks are crucial for fundamental science and technology.
• Existing spectroscopy methods like Ramsey's are susceptible to interrogation-induced line shifts, limiting clock accuracy.
• Minimizing systematic errors is essential for advancing optical clock performance.

Purpose of the Study:

• To develop a robust spectroscopy technique immune to common interrogation-induced line shifts.
• To enhance the accuracy of atomic clocks by eliminating systematic errors.
• To demonstrate the effectiveness of the new method on a relevant atomic transition.

Main Methods:

• Devised a perturbation-immune version of Ramsey's method using phase-congruent probe cycles of unequal durations.
• Actively balanced spectroscopic responses to counteract systematic errors.
• Experimentally demonstrated the technique on the ^{171}Yb^{+} electric octupole optical clock transition.

Main Results:

• The autobalanced Ramsey spectroscopy method effectively eliminated light shifts, phase chirps, and transient Zeeman shifts.
• Interrogation defects were shown not to translate into clock errors.
• Experimental results confirmed the method's ability to maintain clock accuracy despite perturbations.

Conclusions:

• The developed autobalanced Ramsey spectroscopy is a simple and universal approach for high-precision spectroscopy.
• This technique opens pathways for achieving frequency accuracy below the 10^{-18} level for Yb^{+} and other optical clocks.
• The method significantly reduces systematic uncertainties in atomic clock operation.