French quantum computing startup Quobly has announced a milestone in its pursuit of fault-tolerant quantum computing, leveraging traditional semiconductor manufacturing technology to make commercial-scale quantum computers a reality.
By adopting a fabless model and utilizing FD-SOI technology, a commercially available CMOS platform manufactured by industry leaders like STMicroelectronics, GlobalFoundries, and Samsung, Quobly aims to capitalize on decades of semiconductor infrastructure investments.
The company’s work, presented at the 2024 International Electron Devices Meeting (IEDM), demonstrates key building blocks for a quantum computer, including low-temperature operations, single qubit operations using hole and electron spin qubits, and charge control in commercial FD-SOI technology.
This achievement positions FD-SOI as essential for scalable quantum processors and establishes Quobly as a leader in cost-efficient, fault-tolerant quantum computing.
Scalable Quantum Computing with FD-SOI Technology
Quobly, a French quantum computing startup, has announced a significant milestone in the development of fault-tolerant quantum computing. By leveraging traditional semiconductor manufacturing fabs and CEA-Leti‘s R&D pilot line, Quobly has demonstrated that FD-SOI (Fully Depleted Silicon on Insulator) technology can serve as a scalable platform for commercial quantum computing.
The semiconductor industry has played a crucial role in enabling classical computers to scale at cost; it has the same transformative potential for quantum computers, making them commercially scalable and cost-competitive. Quobly’s approach focuses on silicon spin qubits, which are well-suited for achieving fault-tolerant, large-scale quantum computing. These qubits have registered clock speeds in the µsec range, fidelity above 99% for one and two-qubit gate operations, and incomparably small unit cell sizes (in the hundredths of 100nm²).
To capitalize on decades of semiconductor infrastructure investments, Quobly has adopted a fabless model. This approach focuses on FD-SOI, a commercially available CMOS technology manufactured by global leaders like STMicroelectronics, GlobalFoundries, and Samsung, as a platform for quantum computing.
Overcoming Critical Challenges in Scaling Quantum Systems
Quobly’s work, reported at the International Electron Devices Meeting (IEDM) on December 9th, 2024, addresses the critical challenges for scaling quantum systems. In collaboration with CEA-Leti, CEA-IRIG, and CNRS, Quobly has demonstrated the key building blocks for a quantum computer leveraging commercial FD-SOI.
The achievements include low-temperature operations and characterization of digital and analog performances, adhering to circuit design guidelines. Additionally, single qubit operations using hole and electron spin qubits have been demonstrated using CEA-Leti’s R&D pilot line. This ambipolar platform optimizes system performance, leveraging electrons’ long coherence times for memory, as well as the holes’ strong spin-orbit interaction for fast data processing.
Furthermore, charge control in commercial GF 22FDX has been demonstrated to further define a standard cell for a two-qubit gate. These achievements position FD-SOI as essential for scalable quantum processors and establish Quobly as a pioneer in cost-efficient, fault-tolerant quantum computing.
Cryogenic Control Electronics and Ambipolar Spin Qubits
Quobly’s work has also demonstrated significant advancements in cryogenic control electronics and ambipolar spin qubits. The cryogenic control electronics have achieved voltage gain up to 75dB, noise levels of 10-11V²∙μm²/Hz, and threshold voltage variability of 1.29mV∙μm.
The ambipolar spin qubits have co-integrated hole and electron qubits on FD-SOI technology, achieving 1μs manipulation speed for holes and 40μs coherence time (Hahn echo) for electrons. These achievements are crucial for the development of scalable quantum processors.
Towards Commercial Quantum Systems
Quobly’s work positions FD-SOI as a key platform for scalable quantum processors and establishes the company as a pioneer in cost-efficient, fault-tolerant quantum computing. By co-integrating quantum and classical components on the same platform, Quobly is shaping scalable QSoC (Quantum System-on-Chip) architectures.
This approach has significant implications for the development of commercial quantum systems. By leveraging traditional semiconductor manufacturing infrastructure, Quobly’s technology has the potential to make quantum computing more accessible and cost-competitive. As the company continues to advance its technology, it is likely to play a crucial role in shaping the future of quantum computing.
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