Entanglement-enhanced metrology and Hubbard model simulation with strontium atom arrays

Atom arrays are a powerful tool for quantum science. We present recent advances in Hubbard quantum simulation and entanglement-enhanced metrology using strontium atoms trapped in a tweezer-programmable optical lattice. On the metrology side, we demonstrate a family of multiqubit Rydberg gates which enable us to generate up to 9-atom GHZ states and cascades of multiple GHZ-state sizes on the optical clock transition [1]. We also present a new technique using autoionization of divalent atoms to suppress deleterious collective losses during Rydberg dressing, which we use to improve the production of spin-squeezed states [2]. On the simulation side, we explore atom-by-atom assembly of Fock states in the lattice as a new initial resource for atomic Hubbard model simulation, in contrast to the traditional paradigm of bulk degenerate gases. Starting from these assembled Fock states, we demonstrate the preparation of a superfluid in the lattice.

References:

[1] A. Cao, W. J. Eckner, T. Lukin-Yelin, A. W. Young, S. Jandura, L. Yan, K. Kim, G. Pupillo, J. Ye, N. Darkwah Oppong, A. M. Kaufman, Nature 634, 315–320 (2024)

[2] A. Cao, T. Lukin-Yelin, W. J. Eckner, N. Darkwah Oppong, A. M. Kaufman, arXiv:2410.09746