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|Paper IPM / Physic / 17134||
Optical lattices are the basic blocks of atomic quantum technology. The scale and resolution of these lattices are diffraction-limited to the light wavelength. Tight confinement of single sites in conventional lattices requires excessive laser intensity which in turn suppresses the coherence due to enhanced scattering. This article proposes a new scheme for atomic optical lattice with sub-wavelength spatial structure. The potential is formed by the nonlinear optical response of the three-level Rydberg-dressed atoms, which is not constrained by the diffraction limit of the driving fields. The lattice consists of a 3D array of ultra-narrow Lorentzian wells with sub-nanometer widths. The scheme allows moving adjacent sites to close distances with sub-nanometer resolution. These extreme scales are now optically accessible by a hybrid scheme deploying the dipolar interaction and optical twist of atomic eigenstates. The interaction-induced two-body resonance that forms the trapping potential, only occurs at a peculiar laser intensity, localizing the trap sites to ultra-narrow regions over the standing-wave driving field. The Lorentzian trapping potentials with 2Ã
width and 30MHz depth are realizable with scattering rates as low as 1Hz. The mentioned improvements allow quantum logic operations with Rydberg-Fermi interaction. These techniques are particularly demanding for the realization of atomtronics, quantum walks, Hubbard models, and neutral-atom quantum simulation.
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