Cryogenic Qubit Readout and Control

Our research and development activities are focused on innovative cryogenic electronics that can address the wiring bottleneck associated with the scaling of quantum computers. This approach brings classical control and readout electronics in direct vicinity to the quantum bits and down to the milli-Kelvin temperature stage. We leverage the extensive expertise and technological advancements which have been accumulated over decades in the semiconductor CMOS industry.

Contact

Dr.-Ing. Patrick VliexScientific CoordinatorBuilding 02.5 / Room E1+49 2461/61-9409

Dr.-Ing. Dennis NielingerScientific CoordinatorBuilding 02.5 / Room E1+49 2461/61-96920

M.Sc. Mario SchlösserTechnology CoordinatorBuilding 02.5 / Room 116+49 2461/61-3279

These cryogenic CMOS integrated circuits facilitate a paradigm shift in quantum bit scalability due to their unparalleled integration capability, which allows for the use of up to billions of transistors in a single chip. These circuits are designed to achieve high performance while minimizing power consumption and thermal dissipation, which are essential for enabling efficient quantum bit control and measurement. We collaborate with industry and academic partners in research projects to develop increasingly complex, dense, and scalable cryogenic systems.

Our innovations in IC design not only support current quantum technologies but also lay the groundwork for future breakthroughs in large-scale quantum computing.

Research Projects

QSolid

We are involved in QSolid leading WP5 – Hardware Integration Technology, researching on the optimization of cryoelectronics. Our work includes the cryogenic characterization of GF 22FDX technology. Additionally, we are building a demonstrator cryogenic CMOS chip designed to control the quantum processing units (QPUs), showcasing their functionality in a cryogenic environment for future applications.

Our electronic hardware engineering is developing a quantum computing demonstrator within QSolid, integrated into the JUNIQ supercomputing infrastructure at Forschungszentrum Jülich. Specializing in PCB design and modular crate-based architectures, we create scalable room-temperature electronics for qubit control and readout. Using FPGA-based systems, we ensure precise signal generation, real-time data acquisition, and low-latency processing. In collaboration with PGI-13 and KIT's IPE, we define system architectures for flux control pulse generation and data handling, optimizing hardware, firmware, and software to overcome commercial limitations. Our work supports the seamless integration of cryogenic superconducting quantum processors, advancing scalable and high-fidelity quantum computing.
More information: www.q-solid.de

Quantum Large-Scale Integration (QLSI2)

The Quantum Large-Scale Integration (QLSI2) project is a collaborative initiative funded by the Europeans Union under the Horizon program to advance European quantum computing. 23 partners across 9 countries aim to develop a 200-qubit semiconductor-based quantum computer by the end of 2027. The group comprises a diverse group of European partners, including research and technology organizations, academic institutions, startups, and large enterprises. This multidisciplinary team brings together expertise from the entire quantum technology ranging from hardware development to software integration.
The project works on two technologies in parallel: heterostructure-based and fully depleted silicon-on-insulator (FD-SOI). By advancing both technology and manufacturing readiness levels, QLSI2 aims to meet Europe's ambitious goals in quantum technologies, with a particular emphasis on scalability.
Our institute plays a pivotal role in QLSI2 by exploring the scalability of the peripheral electronics in close vicinity of the qubits at low temperatures. This research is crucial for scalability aspects, which are essential for the future of quantum processors. Through our contributions, we aim to enhance the scalability of silicon-based qubits, thereby allowing for large-scale integration in quantum computing systems.
More information: https://qlsi2.eu/

Demonstration of Cryogenic Electronics Co-Integration

Research on Advanced Design Techniques

Circuit Simulation