Ultracold molecules are a powerful platform for metrology, precision measurements and searches for new, beyond-the-Standard-Model physics. Sr2, thanks to its simple structure, insensitivity to external fields and narrow optical transitions, provides an excellent testbed for the search for new interactions. Here, we present a detailed characterization of our 88Sr2 molecular clock for a vibrational transition spanning the entire depth of the ground state potential. We also discuss prospects to use strontium isotopologues to place improved constraints on new mass-dependent forces, including possible pathways toward the production of ultracold 86Sr2 and 84Sr2 dimers and spectroscopy of clock lines in these species for use in the search for new mass-dependent forces.
Clocks that are based on atomic and molecular transitions can serve as unparalleled sensors of fundamental phenomena. In particular, a clock based on vibrations in a diatomic molecule is a highly precise sensor of the interatomic force, including possible contributions from new physics. Such a clock is also of metrological interest, since vibrational states in homonuclear molecules have extremely long lifetimes. We present the technique of near-resonant magic-wavelength trapping for strontium dimers, which allows us to reach coherence times exceeding 100 ms for far-separated vibrational state superpositions. The development of the molecular clock is accelerated through state-of-the-art quantum chemistry work.
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