Sub-nanometer confinement and phononic bus in multi-dimensional atomic lattice

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 talk proposes a new scheme for atomic optical lattice with sub-wavelength spatial structure. The atom light interaction coupling combined with Rydberg interaction has opened a wide range of applications in quantum technology [1-10]. This presentation utilises the nonlinear optical response of the three-level Rydberg-dressed atoms to form ultra-narrow trapping potentials [11]. This arrangement 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. 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 [12], only occurs at a peculiar laser intensity, localizing the trap sites to ultra-narrow regions over the standing-wave drivin. The tight confinement is desired for quantum logic operations with Rydberg-Fermi interaction [13-14], and distance selective operations [15]. Finally, the interaction induced trapping forms collective motional modes among lattice sites generating phononic bus in three dimensional lattice.

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