Micro-optical systems for quantum technologies with laser-trapped neutral atoms based on rapid prototyping by 3D direct laser writing

State of the art 3D direct laser printing allows for fast and flexible fabrication of complex micro-optical systems. We present recent work with micro-lens arrays fabricated by femtosecond direct laser writing. Each lenslet generates an individual laser spot that can be configured to serve as an optical-tweezer trap for neutral atoms. Systems consisting of individual ultra-cold atoms in 2D registers of optical tweezers are well suited for neutral-atom based quantum technologies: Efficient quantum simulation, quantum information processing, and quantum metrology require scalable architectures that guarantee the allocation of large-scale resources of quantum systems. The implementation of 3D direct laser printing gives access to flexible multisite geometries for single-atom quantum systems. The fast production cycle allows to create arrays with arbitrary geometries on demand. This approach combines the advantages of optical tweezers generated by micro-optics with a highly adaptable geometries that will allow us to study a great variety of quantum phenomena in 2D quantum state registers.