The Warped Electron: How to Listen to an Inaudible Note ⚡ экспресс
A spin interferometer using ultracold YbF molecules and a full set of techniques for measuring the electron's electric dipole moment ($$d_e$$). Molecules are cooled in an optical molasses and prepared in a single internal quantum state. A Raman transition creates a spin superposition that evolves in parallel electric and magnetic fields; a second Raman transition converts the phase accumulation into populations of two hyperfine states. Detectors with near-unity spatial and temporal resolution efficiency read out the populations. The efficiencies and accuracies of all stages are characterized, and the sensitivity of the method for measuring $$d_e$$ is assessed.
A tuning fork rings dully when it strikes a crack. That principle scales up in this experiment: physicists turned molecules into an ultrasensitive tuning fork to eavesdrop on the electron's asymmetry. Ytterbium fluoride molecules are cooled to near absolute zero, and then laser spectroscopy sets the electron vibrating in two states simultaneously. If its internal charge is lopsided, a phase shift pops up — a sour note strictly forbidden by the Standard Model (the reigning theory of particles). Catching it would mean rewriting physics.
🎯 The asymmetry being chased is so small that if the electron were the size of Earth, its effect on the radius would be thinner than a spider's web.