Scalable Technology for Quantum Computers

Qubits Under Control Scalable Technology for Quantum Computers Through Spatial Light Modulators

2025-09-04 From Sebastian Gerstl | Translated by AI 1 min Reading Time

A project by Fraunhofer IPMS and MPQ demonstrates how micro-mirror-based spatial light modulators can precisely control atomic qubits in the UV range. According to the researchers, this represents a crucial step for scalable quantum computers.

SLM component for phase modulation based on tilting mirror arrays.(Image: Fraunhofer IPMS) — SLM component for phase modulation based on tilting mirror arrays.
(Image: Fraunhofer IPMS)

As part of the SMAQ project ("Scalable Optical Modulators for Atomic Quantum Computers"), the Fraunhofer IPMS and the Max Planck Institute for Quantum Optics have developed a method for the high-precision control of neutral atoms using laser technology. The focus was on generating optical lattices through spatial light modulators (SLMs) operating in the ultraviolet spectrum – a key component for scalable atomic quantum computers.

Laser as Quantum Exciter

The core of the solution is micro-mirror-based SLMs, which allow programmable phase patterns to be generated on the nanometer scale. These patterns are converted into precise laser beam schemes using special optics, creating so-called optical tweezers. In these focal points, individual strontium atoms can be captured and manipulated as qubits.

The technology addresses a key challenge in quantum optics: the precise excitation of atomic states in the UV range. While previous SLM technologies primarily rely on liquid crystals and operate in the visible spectrum, the micro-mirror-based systems developed by Fraunhofer IPMS enable significantly higher modulation speed, UV compatibility, and polarization independence.

The phase control demonstrated in the project is below one-hundredth of the wavelength, meeting the requirements for high-quality optical tweezers. The MPQ successfully tested the prototype developed by Fraunhofer IPMS in an experimental setup for laser cooling and positioning of neutral atoms.

The goal of future development stages is to scale the technology to several thousand focused UV laser beams and to significantly increase the modulation speed beyond the currently achieved 1 kHz. This brings an addressable, scalable platform for atomic quantum processors within reach. (sg)

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Date: 08.12.2025

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