11 Aug Laser amplifiers for scalable quantum computers
As the number of qubits increases, so do the requirements for the optical control of trapped-ion quantum computers. In the QAmp project, Fraunhofer Institute for Reliability and Microintegration IZM and the companies NeQxt and EOT are developing compact laser amplifiers for the wavelengths of 455 nm and 493 nm. According to Fraunhofer IZM, the modules are designed for integration into existing and future quantum computing systems and aim to address one of the key bottlenecks in scaling trapped-ion architectures.
Integrated optics and amplifier
Fraunhofer IZM is developing highly integrated amplifier modules in which the laser amplifier and an optical isolator specially designed for the required wavelengths are integrated into a hermetically sealed glass package. The amplified light is coupled out via an optical fiber.
The development presents several technical challenges. Fraunhofer IZM is developing a vacuum welding process to hermetically seal the glass package and protect the semiconductor laser from environmental influences. Heat dissipation is achieved through metallized through-glass vias (TGVs). The researchers also integrate an anti-reflection-coated window directly into the package and avoid the use of adhesives to eliminate outgassing.
Modules for series production
Together with its project partners, Fraunhofer IZM is developing the amplifier modules with a view to reproducible manufacturing. The modules will then be validated on a trapped-ion quantum computer developed by NeQxt. A successful validation would not only demonstrate the technical feasibility of the approach but also contribute to the industrial availability of this key technology. According to the institute, the project also aims to support the establishment of a European supply chain for key components used in quantum technologies.
Source: www.izm.fraunhofer.de