Compensation of Field-Induced Frequency Shifts in Ramsey Spectroscopy of Optical Clock Transitions

Abstract

We have extended Ramsey spectroscopy by stepping the probe frequency during the two Ramsey excitation pulses to compensate frequency shifts induced by the excitation itself. This makes precision Ramsey spectroscopy applicable even for transitions that have Stark and Zeeman shifts comparable to the spectroscopic resolution. The method enables a new way to evaluate and compensate key frequency shifts, which benefits in particular, optical clocks based on magnetic field-induced, spectroscopy, two-photon transitions, or heavily forbidden transitions.

5 pages, 3 figures

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• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Direct excitation of the forbidden clock transition in neutral 174Yb atoms confined to an optical lattice
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• Quantum engineering of atomic phase-shifts in optical clocks
• Universal ultra-robust interrogation protocol with zero probe-field-induced frequency shift for quantum clocks and high-accuracy spectroscopy
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• SU(2) hyper-clocks: quantum engineering of spinor interferences for time and frequency metrology
• Engineered Molecular Clock Transitions for Symmetry Violation Searches