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Metrology, Inspection, and Process Control XXXVI

Silicon-based quantum computing: manufacturing and metrology challenges (Conference Presentation)

Richard M. Silver

Published Mar 26, 2019• 0 citations
Publisher

Abstract

Over the last 20 years there has been a steady increase in fundamental physics research and the hardware development needed to realize a quantum computer. However, in the last 5 years we have seen a dramatic increase in the interest from industry, including a variety of major semiconductor and technology leaders such as IBM, Google and Intel. This is the result of both a better understanding of the variety of problems that can be addressed and the impact that will come with quantum computing along with the emergence of a couple of potentially scalable hardware solutions. In a recent interview with a leading manufacturer, an aggressive strategy was laid out to achieve an operational 1000-qubit quantum computer within 5 years that can solve a variety of problems not addressable by conventional computing and the 10-year prospect to achieve a 1 million qubit machine that would “profoundly change society”. The major technology leaders view quantum information (QI) as a technology that they must begin to develop and understand today. Augmenting existing technology with QI is desirable, but , there are a variety of technical challenges to making silicon-based QI systems with the needed quantum properties and coherence times. New challenges in atomic precision and individual atom or electron effects that fundamentally affect device performance bring on a variety of new manufacturing and metrology challenges. Measuring electron spin coherence, exchange energies, and qubit fidelity are entirely new measurements for the semiconductor industry. Even the resolution of TEM may be inadequate, as TEM of a nominally 80 nm thick slice of silicon which averages many atoms together in a measurement where only one or two atoms can deeply change device performance, coherence times, or introduce charge offsets. After developing some of the first cold atom and ion trap quantum information demonstrations at NIST, we are now investing significantly in developing the supporting metrology and modeling methods needed to help industry develop and commercialize this new technology. In this presentation we will provide an overview of hardware solutions for quantum computing, future metrology needs and challenges to enable manufacturable quantum computers. Although industry leaders are now investing in superconducting qubits and silicon-based qubits, the two leading technologies, this talk will primarily focus on the principles of solid state silicon QI operation, manufacturing metrology solutions, and measurements needed to develop and evaluate viable technological solutions.

DOI
10.1117/12.2517365

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Over the last 20 years there has been a steady increase in fundamental physics research and the hardware development needed to realize a quantum computer. However, in the last 5 years we have seen a dramatic increase in the interest from industry, including a variety of major semiconductor and technology leaders such as IBM, Google and Intel. This is the result of both a better understanding of the variety of problems that can be addressed and the impact that will come with quantum computing along with the emergence of a couple of potentially scalable hardware solutions. In a recent interview with a leading manufacturer, an aggressive strategy was laid out to achieve an operational 1000-qubit quantum computer within 5 years that can solve a variety of problems not addressable by conventional computing and the 10-year prospect to achieve a 1 million qubit machine that would “profoundly change society”. The major technology leaders view quantum information (QI) as a technology that they must begin to develop and understand today. Augmenting existing technology with QI is desirable, but , there are a variety of technical challenges to making silicon-based QI systems with the needed quantum properties and coherence times. New challenges in atomic precision and individual atom or electron effects that fundamentally affect device performance bring on a variety of new manufacturing and metrology challenges. Measuring electron spin coherence, exchange energies, and qubit fidelity are entirely new measurements for the semiconductor industry. Even the resolution of TEM may be inadequate, as TEM of a nominally 80 nm thick slice of silicon which averages many atoms together in a measurement where only one or two atoms can deeply change device performance, coherence times, or introduce charge offsets. After developing some of the first cold atom and ion trap quantum information demonstrations at NIST, we are now investing significantly in developing the supporting metrology and modeling methods needed to help industry develop and commercialize this new technology. In this presentation we will provide an overview of hardware solutions for quantum computing, future metrology needs and challenges to enable manufacturable quantum computers. Although industry leaders are now investing in superconducting qubits and silicon-based qubits, the two leading technologies, this talk will primarily focus on the principles of solid state silicon QI operation, manufacturing metrology solutions, and measurements needed to develop and evaluate viable technological solutions.
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It is increasingly accepted that all commercially useful quantum computing applications require error-correction and therefore at least 1 million physical qubits. The manufacturing capability and expertise of the semiconductor industry are needed to deliver a commercially useful quantum computer on any reasonable time or money scale. In this talk, we will show how unique technology in the areas of silicon photonics and quantum system architecture enable the path to manufacturability and scalability of a fault-tolerant, general-purpose 1-milliion qubit quantum computer.
Quantum computing is one of the grand challenges of the 21st century and promises to transform almost every industry. As quantum computing technology exits the academic research phase into manufacturing, the goal is not to build single, unique qubits, but millions of interconnected, identical qubits capable of performing fully error corrected, general purpose calculations. Photon-based qubits offer a path to such a general-purpose machine by leveraging the mature silicon photonics high-volume manufacturing ecosystem. Creating quantum devices from silicon photonics components requires patterning innovation to bring leading-edge nanolithography to near macroscopic scale, a unique challenge for an industry where the future relies on progressive device shrink.
The threshold of the second quantum revolution has been reached; wherein isolated quantum systems are being utilized for macroscopic applications. With the exponential scaling of quantum computers and cross-industry milestones such as the goal of delivering fault-tolerant systems with 200 logical qubits and 100 million gates by 2029 entirely new possibilities in computing are emerging. In production engineering, the growing complexity and interconnectivity of dynamic manufacturing processes, combined with the vast data volumes generated by digital twins, will soon demand computing capabilities beyond what classical architectures can efficiently provide. At present, quantum hardware does not yet have computing power or error-free operation required for complex industrial applications. However, the immense scaling potential offered by quantum effects makes it indispensable for manufacturing technology. The presentation introduces fundamentals of quantum hardware, compares physical qubit realizations, and explains the core quantum principles. The manipulation of quantum states is achieved via unary and binary gates. Complex industrial applications, such as the optimization of logistics and process chains, are expected to require more than 1,000 error-corrected qubits. Hardware-software co-design is thus essential. In the field of production engineering, the development and validation of application-specific algorithms for these future quantum systems must therefore begin now. As an exemplary case study for these future areas of research, this presentation will show the evaluation of quantum computing in digital twins using the example of a drilling process analysis based on Bayesian inference. For root-cause analysis, high-frequency NC signal data (currents, jerk, contour deviations) from 264 boreholes were processed. This probabilistic model for identifying causes is mapped as a Quantum Bayesian Network (12 qubits) on a quantum circuit. Because exact Bayesian inference is known to be #P-complete, it is considered a highly promising candidate for future quantum advantages in manufacturing research. Comparing classical hardware, quantum simulators (Qiskit), and real quantum hardware (IBM Hanoi) reveal current limitations but also significant future potential. Current NISQ systems still exhibit substantial deviations (maximum absolute error sometimes over 60%) when processing such networks, primarily due to limited qubit connectivity, the lack of native multi-controlled rotation gates, and the challenges of non-binary discretization. Nevertheless, the successful use of quantum simulators with errors below 3% proves that the development and validation of practical quantum algorithms are already possible and highly beneficial today. © 2026 The Authors. Published by TU Wien, Institute of Production Engineering and Photonic Technologies. Peer-review under the responsibility of the scientific committee of the 7th Wiener Produktionstechnik Kongress (WPK 2026). Published in: F. Bleicher, O. Bodur, T. F. Trautner (Eds.), From Data-Driven Production to Autonomous Manufacturing Systems - Tagungsband zum 7. Wiener Produktionstechnik Kongress (WPK 2026), pp. 37-38, ISBN 978-3-9505584-1-8, TU Wien, Vienna, Austria, October 2026. DOI: 10.5281/zenodo.22954666. Conference: 7th Wiener Produktionstechnik Kongress (WPK 2026), October 7-8, 2026, Vienna, Austria. Organized by the Institute of Production Engineering and Photonic Technologies (IFT), TU Wien. Website: https://www.produktionstechnik.at
Quantum computing is one of the grand challenges of the 21st century and promises to transform almost every industry. As quantum computing technology exits the academic research phase into manufacturing, the goal is not to build single, unique qubits, but millions of interconnected, identical qubits capable of performing fully error corrected, general purpose calculations. Photon-based qubits offer a path to such a general-purpose machine by leveraging the mature silicon photonics high-volume manufacturing ecosystem. Creating quantum devices from silicon photonics components requires patterning innovation to bring leading-edge nanolithography to near macroscopic scale, a unique challenge for an industry where the future relies on progressive device shrink.