Quantinuum’s H1 quantum computer successfully executes a fully fault-tolerant algorithm with three logically-encoded qubits
A multidisciplinary team from Quantinuum, QuTech (Delft University of Technology) and the University of Stuttgart used the H1 quantum computer to demonstrate a noteworthy advance in fault-tolerant operations
Cambridge, UK and Broomfield, Colorado, September 28th, 2023 — Fault-tolerant quantum computers that offer radical new solutions to some of the world’s most pressing problems in medicine, finance and the environment, as well as facilitating a truly widespread use of AI, are driving global interest in quantum technologies. Yet the various timetables that have been established for achieving this paradigm require major breakthroughs and innovations to remain achievable, and none is more pressing than the move from merely physical qubits to those that are fault-tolerant.
In one of the first meaningful steps along this path, scientists from Quantinuum, the world’s largest integrated quantum computing company, along with collaborators, have demonstrated the first fault-tolerant method using three logically-encoded qubits on the Quantinuum H1 quantum computer, Powered by Honeywell, to perform a mathematical procedure.
Fault-tolerant quantum computing methods are expected to open the way for practical solutions to real-world problems across domains such as molecular simulation, artificial intelligence, optimization, and cybersecurity. Following a succession of important breakthroughs in recent years in hardware, software and error correction, today's results announced by Quantinuum in a new paper on the arXiv, "Fault-Tolerant One-Bit Addition with the Smallest Interesting Colour Code" are a natural step forward, and reflect the growing pace of progress.
Many companies and research groups are focused on achieving fault-tolerance by handling the noise that naturally arises when a quantum computer performs its operations. Quantinuum is a proven pioneer, achieving previous firsts such as demonstrating entangling gates between two logical qubits in a fully fault-tolerant manner using real-time error correction, and simulating the hydrogen molecule with two logically-encoded qubits.
By performing one-bit addition using the smallest-known fault-tolerant circuit, the team achieved an error rate almost an order of magnitude lower, at ~1.1x10-3 compared to ~9.5x10-3 for the unencoded circuit. The error suppression observed was made possible by the physical error rates of the quantum charge-coupled device (QCCD) architecture used in Quantinuum’s H-Series quantum computers, which are lower than in any other systems known to date. These error rates fall within the range at which fault-tolerant algorithms become feasible.
Ilyas Khan, Chief Product Officer and Founder at Quantinuum, said: “In addition to continuing to provide the quantum ecosystem with evidence of what is possible in these early days of quantum computing, the current demonstration is noteworthy for its ingenuity. The ion trap architecture of our H-Series offers the lowest physical error rates and the flexibility derived from qubit transport, which allows users of our hardware to implement a much wider choice of error-correcting codes, and that is what made this possible. Watch out for further important computational advances in the coming period as we link up the quality of our hardware with tasks that are meaningful in the real world.”
Low-overhead logical Clifford gates, in combination with the transversal CCZ gate of the three-dimensional color code, enabled the team to reduce the number of two-qubit gates and measurements required for one-bit addition, from over 1000, to 36.
Ben Criger, Senior Research Scientist at Quantinuum, and principal investigator on the paper, said: “The CCZ gate, which we’ve demonstrated here, is a key ingredient in Shor’s algorithm, quantum Monte Carlo, topological data analysis, and a host of other quantum algorithms. This result proves that real hardware is now capable of running all the essentials of fault-tolerant quantum computing – state preparation, Clifford gates, non-Clifford gates and logical measurement – together.”
About Quantinuum
Quantinuum is the world’s largest integrated standalone quantum computing company, formed by the combination of Honeywell Quantum Solutions’ world-leading hardware and Cambridge Quantum’s class-leading middleware and applications. Science-led and enterprise-driven, Quantinuum accelerates quantum computing and the development of applications across chemistry, cybersecurity, finance and optimization. Its focus is to create scalable and commercial quantum solutions to solve the world’s most pressing problems in fields such as energy, logistics, climate change, and health. The company employs over 480 individuals, including 350+ scientists and engineers, at eight sites across the United States, Europe, and Japan. For more information, please visit https://www.quantinuum.com.
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About Quantinuum
Quantinuum, the world’s largest integrated quantum company, pioneers powerful quantum computers and advanced software solutions. Quantinuum’s technology drives breakthroughs in materials discovery, cybersecurity, and next-gen quantum AI. With over 500 employees, including 370+ scientists and engineers, Quantinuum leads the quantum computing revolution across continents.
Santa Clara, Calif. – March 18, 2025 – Quantinuum, the industry leader in quantum computing with the world’s highest performing quantum computer, will work with NVIDIA as a founding collaborator on breakthroughs at the NVIDIA Accelerated Quantum Research Center, where operations are expected to begin later this year.
NVIDIA Accelerated Quantum Computing Research Center (NVAQC) will provide the ability to develop quantum solutions and applications that help solve some of the world’s most pressing problems. The center will accomplish this by using NVIDIA CUDA-Q platform alongside a world leading NVIDIA GB200 NVL72 supercomputer with Quantinuum’s System H2, which achieves 2,097,152 Quantum Volume — orders of magnitude greater than the next best available.
Quantinuum’s quantum computing architecture delivers the fastest time-to-solution available and is positioned to extend this leadership with its next-generation systems. By 2027, Quantinuum will launch the industry’s first 100-logical-qubit system, featuring best-in-class error rates. The company is also on track to deliver commercially scalable quantum computers with hundreds of logical qubits by the end of the decade. This progress builds upon a series of recent technology breakthroughs, including Quantinuum’s creation of the most reliable and highest-quality logical qubits, as well as solving the key scalability challenge associated with ion-trap quantum computers — culminating in a commercial system with greater than 99.9% two-qubit gate fidelity.
In 2022, Quantinuum became the first company to bring CUDA-Q to its Quantum systems, establishing a pioneering collaboration that continues to advance the platform today in multiple areas including application development and Quantum Error Correction (QEC). Users of CUDA-Q are currently offered access to Quantinuum’s System H1 QPU and emulator for 90 days. Quantinuum’s future systems will continue to support the CUDA-Q platform and be available via the NVAQC, accelerating the adoption of Generative Quantum AI (Gen QAI).
Quantinuum’s groundbreaking Gen QAI system, announced last month, enables data generated by Quantinuum’s quantum systems to be harnessed to train AI systems, significantly enhancing the fidelity of AI models, and allowing them to tackle challenges previously deemed unsolvable. Through this achievement, Quantinuum is setting a new standard for AI training and problem-solving across various industries.
“By combining NVIDIA's AI hardware and software solutions with leading and differentiated solutions from Quantinuum, we’re unlocking unprecedented solutions and accelerating Generative Quantum AI’s adoption across diverse markets,” said Dr. Rajeeb Hazra, President and CEO of Quantinuum.
"Progress toward useful quantum computing hinges on new discoveries," said Tim Costa, Senior Director of CAE, Quantum, and CUDA-X at NVIDIA. "The NVAQC will fast-track the development of useful quantum devices, being the epicenter for breakthroughs made with partners like Quantinuum."
About Quantinuum
Quantinuum is the world leader in quantum computing. The company’s quantum systems deliver the highest performance across all industry benchmarks. Quantinuum’s over 550 employees, including 370+ scientists and engineers, across the US, UK, Germany, and Japan, are driving the quantum computing revolution.
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TOKYO, JAPAN – February 12, 2025 – Quantinuum, the world’s largest integrated quantum computing company, and RIKEN, Japan’s largest comprehensive research institution, today announced the successful on-premise installation of Quantinuum’s “Reimei” quantum computer at RIKEN’s Wako campus in Saitama, Japan. RIKEN has designed, prepared, and delivered a world-class facility for the trapped-ion quantum computer, which will enable generations of high-performance quantum systems.
This state-of-the-art machine is now fully operational, ushering in a new era of discovery and innovation. With its installation at RIKEN’s world-class facility, Japanese researchers now have direct, on-site access to Quantinuum’s cutting-edge quantum computing technology, renowned for being the highest performing systems in the world. Quantinuum’s hardware stands out as the only available system using a unique architecture that physically moves qubits, unlocking new tools and possibilities unavailable on other platforms. The exceptional performance and consistency of the system are supported by the stability of the facility's world-class environment, which is designed, built, and maintained to maximize the capabilities of Quantinuum's quantum computers.
Named “Reimei,” which translates into “dawn” in Japanese, this powerful quantum computer symbolizes the incredible potential of quantum technology and integrated hybrid computational platforms. The trapped-ion quantum computer by Quantinuum will work in harmony with RIKEN’s famed Japanese flagship supercomputer Fugaku, creating a cutting-edge quantum-HPC hybrid platform designed to tackle computations that surpasses the capabilities of traditional supercomputers—an exciting leap forward for scientific research.
This groundbreaking installation is part of an ambitious project commissioned by the New Energy and Industrial Technology Development Organization (NEDO), a national research and development entity under Japan’s Ministry of Economy, Trade and Industry.
Looking ahead, the next phase of this collaboration will focus on the integration of a quantum-HPC hybrid platform in 2025. Quantinuum is excited to team up with RIKEN and other partners to optimize operations within this innovative hybrid environment.
Additionally, Quantinuum will continue collaborating with RIKEN researchers to advance scientific discovery across various applications. The company will work with local suppliers to enhance the quantum supply chain and foster growth within the Japanese quantum computing ecosystem through customized, in-person workshops and tutorials.
Dr. Mitsuhisa Sato, Division Director of the Quantum-HPC Hybrid Platform Division, RIKEN Center for Computational Science, said: “Reimei’s high-fidelity qubits and all-to-all connectivity will significantly enhance the research possibilities of our quantum-HPC hybrid platform. We are thrilled to explore new frontiers in scientific research on quantum-HPC hybrid applications by using the Quantinuum system with our Fugaku.”
Dr. Rajeeb Hazra, President and CEO of Quantinuum, emphasized the significance of this milestone: “This installation represents a pivotal moment for our global strategy, marking the first on-site deployment of our quantum technology outside the U.S. We are eager to collaborate with RIKEN’s exceptional researchers, whose expertise will be instrumental in driving unprecedented scientific breakthroughs.”
About RIKEN
RIKEN, a National Research and Development Agency, is Japan’s largest comprehensive research institution renowned for high-quality research in a diverse range of scientific disciplines. Founded in 1917, initially as a private research foundation, RIKEN has grown rapidly in size and scope, today encompassing a network of world-class research centers and institutes across Japan.
About Quantinuum
Quantinuum, the world’s largest and leading integrated quantum company, pioneers powerful quantum computers and advanced software solutions. Quantinuum’s technology drives breakthroughs in materials discovery, cybersecurity, and next-gen quantum AI. With over 500 employees, including 370+ scientists and engineers, Quantinuum leads the quantum computing revolution across continents.
For more information, please visit the website at www.quantinuum.com