Quantum Light-Matter Interfaces with Tweezer Atomic Arrays

Tweezer atomic arrays are quickly emerging as one of the most dominant platforms of quantum science and technology. This makes their efficient coupling to light a pressing issue for diverse applications, from state-readout and quantum networks to the generation of entangled states of light. Nevertheless, such efficient interfacing is severely limited in typical tweezer arrays due to large scattering losses to non-paraxial lattice diffraction orders. I will describe our progress in solving this basic problem by using the collective physics of radiation as a resource. First, we derive a general formalism, showing that the quantum interface efficiency of the atom array is universally given by its reflectivity to light [1]. We then apply this principle to develop methods for efficient interfacing: (i) designing a multibeam mode that naturally couples to the array [2]; (ii) eliminating the scattering losses by destructive interference between different array layers [3]; (iii) enhancing the coupling by using a cavity [4]. For all these solutions, we derive analytical theories and design principles, showing favorable scalings with the number of array atoms.