ECAMP 15

Optical lattice operating at the magic wavelength induces identical AC-Stark shifts on two internal states of trapped atoms, permitting a coherent control of the transition. The characteristics is vital for quantum applications based on cooled neutral atoms, including quantum computing, atom clock and precision metrology.

We discovered a new magic wavelength at 476.823545(55) nm for $^{88}$Sr clock transition between the ground $^1$S$_0$ and the metastable $^3$P$_0$ states. When used as Bragg diffraction pulses in the clock atom interferometry, the new magic wavelength provides a larger momentum kick to the atoms compared with the usual magic wavelength at 813.4 nm. This facilitates a greater separation between the two momentum states, thereby enhancing the sensitivity of atom interoferometer. The optical lattice at around 477 nm also has a smaller lattice constant, making it potentially useful for quantum simulation and studies of cooperative effects. Additionally, the result also provides a valuable reference for determining electric dipole matrix elements of nearby atomic transitions.