Mission and Goals

The core mission of QSolid is to establish a national ecosystem for quantum computing in Germany, fostering technological sovereignty and bridging the gap between fundamental research and practical application. Key goals include:

• Development of High-Quality Qubits: Focusing on superconducting qubits, particularly exploring promising architectures like fluxonium qubits alongside established transmon designs, aiming for high coherence times and gate fidelities.
• Scalable Quantum Hardware: Designing and building quantum processors with increasing numbers of qubits, addressing the challenges of scalability, connectivity, and manufacturability.
• System Integration: Creating a complete quantum computing system, encompassing cryogenic infrastructure, control electronics (both cryogenic and room temperature), and interconnects.
• Software Stack and Programming Environment: Developing the necessary software layers, including compilers, control software, error mitigation techniques, and user interfaces, to make the quantum hardware usable.
• HPC Integration: Integrating the quantum computer demonstrator into the existing supercomputing infrastructure at Forschungszentrum J?lich (specifically the J?lich Supercomputing Centre, JSC), enabling hybrid quantum-classical workflows.
• Application Development and Benchmarking: Identifying and implementing relevant quantum algorithms for scientific and industrial applications (e.g., in materials science, quantum chemistry, optimization) and developing benchmarks to assess performance.
• Building a Quantum Ecosystem: Fostering collaboration between academia, research labs, and industry to create a vibrant quantum computing community and supply chain within Germany and Europe.
• Cloud Access: Providing access to the developed quantum computing demonstrators via cloud platforms for research and industry users.

Technology Focus

QSolid concentrates on superconducting qubit technology, which is one of the leading platforms for building fault-tolerant quantum computers. Specific technological areas include:

• Superconducting Qubits: Research and development of various superconducting qubit types, with a strong emphasis on achieving high coherence and gate fidelity. Fluxonium qubits are explicitly mentioned as a key area of investigation due to their potential advantages.
• Quantum Processor Fabrication: Establishing and optimizing fabrication processes for reproducible, high-quality quantum chips.
• Cryogenic Technology: Developing and implementing advanced cryogenic systems required to operate superconducting qubits at temperatures close to absolute zero.
• Control Hardware: Designing and building specialized microwave electronics for qubit control and readout, including solutions operating at cryogenic temperatures (Cryo-CMOS) to reduce complexity and heat load.
• Quantum Software: Creating the full software stack, from low-level pulse control to high-level programming languages and algorithm libraries. This includes developing sophisticated calibration routines and error mitigation strategies.
• System Engineering: Addressing the complex challenge of integrating all hardware and software components into a reliable and performant quantum computing system.

Consortium and Partners

QSolid is a consortium effort, emphasizing collaboration. It comprises 25 partners, including:

• Research Institutions: Forschungszentrum J?lich (Coordinator), Fraunhofer Institutes (e.g., IPMS, IAF), Leibniz Institutes (e.g., IKZ, CIQS), Max Planck Institutes, Karlsruhe Institute of Technology (KIT).
• Universities: Leading German universities with expertise in quantum science and engineering (e.g., RWTH Aachen, University of Ulm, University of Stuttgart, Freie Universit?t Berlin).
• Industry Partners: Companies providing specialized hardware (e.g., cryogenics, electronics), software expertise, and potential end-user perspectives.

This collaborative structure allows QSolid to leverage a wide range of expertise across the entire value chain of quantum computing.

Target Outcomes and "Products"

The primary "product" of the QSolid initiative will be the integrated quantum computer demonstrator itself, accessible to the German scientific community. Rather than offering off-the-shelf quantum computers for sale, QSolid focuses on:

• Quantum Computing Demonstrators: Functional quantum computing systems with increasing qubit counts and quality, integrated into HPC infrastructure.
• Enabling Technologies: Development of specific hardware components (qubit chips, control electronics, cryogenic systems) and software tools (compilers, simulators, control software).
• Know-How and Expertise: Building a skilled workforce and generating intellectual property in quantum computing technology.
• Cloud-Based Access: Providing researchers and industry partners with access to the quantum demonstrators through cloud platforms, enabling them to explore quantum algorithms and applications.
• Benchmarks and Standards: Contributing to the development of methods for characterizing and benchmarking quantum computers.

Significance

QSolid represents a significant strategic investment by Germany to become a key player in the global quantum computing landscape. By building a complete system and fostering a national ecosystem, the initiative aims to:

• Strengthen German and European technological sovereignty in a critical future technology.
• Accelerate the transition of quantum computing from basic research to practical application.
• Provide German researchers and industry with access to cutting-edge quantum computing resources.
• Train the next generation of quantum scientists and engineers.
• Create economic opportunities through the development of a quantum computing supply chain and related services.

In essence, QSolid is building the foundation for a German quantum computing infrastructure, focusing on developing high-quality, scalable superconducting quantum processors and making them accessible for scientific and industrial use.