A Single-Wavelength Trap Array of Neutral Rubidium and Cesium Atoms

Neutral atoms trapped in optical lattice arrays provide a promising framework for quantum computation, but crosstalk between individual qubits limits the functionality of such devices. Using multiple atomic species offers potential solutions to many of the issues single-species quantum computers encounter. We present a two-species trap array using a single laser and exclusively passive optical elements. This array operates at reduced cost, space, and alignment overheads compared to tweezer arrays for even single-species operation.

In this trapping methodology, a custom transmission mask and Fourier filtering is used to create a landscape of alternating high and low optical intensity regions. An 808-nm laser is blue-detuned to Cs’s D lines and red-detuned to Rb’s D lines, allowing for simultaneous trapping of Rb and Cs in bright and dark traps, respectively.

We present progress on atom loading in a 2-D grid array of 27 x 27 Rb trapping sites simultaneously with an interlaced grid of 26 x 26 Cs trapping sites. We report trap lifetimes and radial and axial trap frequencies for both species.