Multi-grating design for integrated single-atom trapping, manipulation, and readout

Abstract

An on-chip multi-grating device is proposed to interface single-atoms and integrated photonic circuits, by guiding and focusing lasers to the area with ∼10 µm above the chip for trapping, state manipulation and readout of single Rubidium atoms. For the optical dipole trap, two 850 nm laser beams are diffracted and overlapped to form a lattice of single-atom dipole trap, with the diameter of optical dipole trap around 2.7 µm. Similar gratings are designed for guiding 780 nm probe laser to excite and also collect the fluorescence of 87 Rb atoms. Such a device provides a compact solution for future applications of single atoms, including the single photon source, single-atom quantum register, and sensor. FIG. 1. (a) Schematic diagram of the multi-focusing-grating structure for hybrid photonic-atom chip. (b) Detailed illustration of the grating from the side view (upper panel) and the top view (bottom pannel).