Spin Interferometry in a Beam of Ultracold Molecules

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Information Science
• Fundamental Physics

Background:

• Precise measurement of the electron's electric dipole moment (EDM) is crucial for testing fundamental symmetries.
• Existing methods face limitations in sensitivity and systematic error control.
• Ultracold molecules offer enhanced sensitivity for EDM searches.

Purpose of the Study:

• To present a novel spin interferometer apparatus utilizing ultracold YbF molecules.
• To develop and validate the complete set of techniques required for measuring the electron's electric dipole moment (d_e).
• To evaluate the sensitivity and potential of this method for future high-precision measurements.

Main Methods:

• Cooling YbF molecules in an optical molasses to achieve ultracold temperatures.
• Preparing molecules in a single, well-defined internal quantum state.
• Utilizing Raman transitions to create and probe spin superpositions in the presence of electric and magnetic fields.
• Employing high-efficiency, spatially and temporally resolved detectors for population readout.

Main Results:

• Demonstration of a functional spin interferometer with ultracold YbF molecules.
• Characterization of the efficiencies and fidelities of all experimental steps.
• Evaluation of the sensitivity of the apparatus for measuring the electron's electric dipole moment (d_e).

Conclusions:

• The developed spin interferometer and techniques provide a promising platform for precise electron EDM measurements.
• The apparatus shows potential for improving current EDM limits.
• Further refinement of techniques could lead to significant advancements in fundamental physics searches.