Optical setup for a two-dimensional tweezer array with independently adjustable columns for neutral atom quantum computing

Abstract

We present an optical design concept to create a two-dimensional tweezer array for neutral atom quantum computing. The first part of the setup splits the four input laser beams into 20 individual beam lines that correspond to the columns of the tweezer array. A combination of an acousto-optic deflector (AOD) and a suitable imaging lens for each beam line creates a magnified image of the one-dimensional columns in the tweezer array with a spacing of less than 200 μm. The spacing between the 20 columns is reduced to this value as well to achieve a spot array with an equidistant spacing in both axes. This is done successively in four steps by using a combination of one discrete mirror cascade and three mirror cascades integrated into monolithic mirror arrays. The final tweezer array with a spacing of 3.5 μm is then created by a two-stage telecentric demagnifying lens group. Unlike other approaches to create a two-dimensional tweezer array (e.g. crossed AODs), the use of a separate AOD for each column allows for an independent adjustment of the spacings within each column and thus a flexible adjustment of the local interaction of neighboring atoms. A raytracing analysis demonstrates that the whole setup produces a telecentric and diffraction-limited image of 20 × 100 spots in the following vacuum chamber.

Authors 13

1. Martin Adams Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

2. Martin Traub Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

3. Hans-Dieter Hoffmann Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

4. Florian Meinert

   University of Stuttgart

   Affiliation as printed

   Univ. Stuttgart (Germany)

5. P. Ilzhöfer

   University of Stuttgart

   Affiliation as printed

   Univ. Stuttgart (Germany)

6. Thomas Westphalen Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

7. Kersten Ludwig Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

8. Jiachen Zhao

   University of Stuttgart

   Affiliation as printed

   Univ. Stuttgart (Germany)

9. A. Scholz

   University of Stuttgart

   Affiliation as printed

   Univ. Stuttgart (Germany)

10. Govind Unnikrishnan

    University of Stuttgart

    Affiliation as printed

    Univ. Stuttgart (Germany)

11. Ratnesh Kumar Gupta

    University of Stuttgart

    Affiliation as printed

    Univ. Stuttgart (Germany)

12. Tilman Pfau

    University of Stuttgart

    Affiliation as printed

    Univ. Stuttgart (Germany)

13. C. Haefner Aachen Fraunhofer-Institut für Lasertechnik ILT

    Fraunhofer Institute for Laser Technology · RWTH Aachen University

    Affiliation as printed

    Fraunhofer-Institut für Lasertechnik ILT (Germany)

    RWTH Aachen Univ. (Germany)