Quantum computing: Laser-optical system offers full control over 2,000 trapped Rydberg atoms

Key Points:

• Fraunhofer ILT in Aachen developed a laser-optical system that positions 2,000 Rydberg atoms with submicrometer precision inside a quantum computer's vacuum chamber at the University of Stuttgart, enabling precise quantum interactions.
• The system uses 2,000 individually controllable laser beams as optical tweezers to trap and arrange strontium atoms at exactly 3.5 µm spacing, critical for two-qubit logic gate operations in the Rydberg quantum computer.
• The design involves splitting four initial laser beams into 2,000 beams through cascading beam splitters and acousto-optic deflectors, followed by complex optical components and precision mirror alignment to achieve the required spacing and control.
• The compact optical system, occupying only 1 square meter and comprising over 150 components, was successfully commissioned without needing readjustment, showcasing Fraunhofer ILT's expertise in laser technology and quantum applications.
• This development supports scalable quantum computing with Rydberg atoms, leveraging their sensitivity to electric fields for precise quantum logic, and aligns with broader quantum technology advances including ion-trap processors and quantum frequency converters.