Logical qubits start outperforming physical qubits
Quantinuum closes in on breakeven point in quantum error correction
Broomfield, Colorado, August 4th, 2022 — Quantinuum researchers have hit a significant milestone by entangling logical qubits in a fault-tolerant circuit using real-time quantum error correction. The research, published in a new scientific paper that was released on August 3rd, is the first experimental comparison study of different quantum error correction codes in similar environments and presents a collection of several different experiments. These experiments include:
- The first demonstration of entangling gates between two logical qubits done in a fully fault-tolerant manner using real-time error correction
- The first demonstration of a logical entangling circuit that has higher fidelity than the corresponding physical circuit.
This milestone achievement is important because it marks the first time that logical qubits have been shown to outperform physical qubits — a critical step towards fault-tolerant quantum computers.
“Quantinuum’s trapped-ion quantum computing roadmap is designed around continuous upgrades, enabled our flexible architecture and our precision control capabilities. This combination provides for outstanding, first-of-its-kind achievements that help accelerate the entire industry,” said Tony Uttley, President and COO of Quantinuum.
David Hayes, a Theory and Architecture Technical Manager at Quantinuum and co-author of the new research paper, said the research moves quantum computing closer to the point where encoded circuits outperform more primitive operations.
“People have worked with error corrected qubits before, but they haven't reached this sort of special point where the encoded operation is working better than the primitive operation,” Hayes said. “The other thing that's new here is that in other experiments we're doing the error correction while we're doing the operations. An important next step for us is to get the error rate induced by the error correction itself down further."
The findings are described in the new research paper, “Implementing Fault-tolerant Entangling Gates on the Five-Qubit code and the Color Code”. The paper was recently published on the arXiv. Scientists used both the H1-1 and the H1-2 quantum computers, Powered by Honeywell, to compare the Five-Qubit error code and the Distance Three Color Code in these tests.
Quantum researchers are in the early days of experimental quantum error correction with a multitude of codes to test. Quantinuum researchers can explore a wider range of quantum error codes, compared to other quantum hardware designs, due to the architecture of the machine.
The System Model H1 uses a trapped-ion design and a quantum charged coupled device architecture (QCCD). Along with the inherent flexibility of this design, another strength is all-to-all connectivity. All the qubits are connected to each other which makes it easy to move information through chains of ions without creating multiple errors along the way.
“Instead of having to build a new machine every time we want to try a new code, we can just program the machine to run a different code, make the measurements and weigh the different pros and cons,” Hayes said.
Advancing quantum error correction
All forms of technology need error correction including servers in data centers and space probes sending transmissions back to Earth. For Quantinuum and other companies in the quantum computing sector, quantum error correction is one of the most important pillars of progress. Errors prevent quantum computers from producing reliable results before they are overwhelmed. Quantinuum’s researchers are working toward the milestone of fault tolerance, meaning the errors can be suppressed to arbitrarily low levels.
Natalie Brown, another co-author of the paper and an Advanced Physicist at Quantinuum, said that most classical error correction principles fail with quantum computers because of the basic nature of quantum mechanics.
“It becomes very difficult to suppress noise to very small levels, and that becomes a problem in quantum computing,” she said. “The most promising candidate was this quantum error correction, where we take the physical qubits, make a logical qubit.”
Logical qubits are groups of physical qubits working together to perform a computation. For each physical qubit used in a computation, other ancillary qubits perform a range of tasks such as spotting and correcting errors as they occur.
Ciaran Ryan-Anderson, a Senior Advanced Physicist at Quantinuum and also a co-author of the new paper, said the newest research paper builds on research performed in 2021 and published in Physical Review X. That work explained how researchers at Honeywell Quantum Solutions applied multiple rounds of quantum error correction to a single logical qubit.
“One of the first really important things to demonstrate was these repeated rounds of quantum error correction cycles,” he said.
That is one of several milestones on Ryan-Anderson’s quantum error correction checklist:
- Conduct repeated rounds of fault tolerant quantum error correction
- Feed forward and conditionally apply syndrome extraction
- Enable real-time determination of correction for a quantum error correction code
- Demonstrate general algorithmic real-time decoding
- Scale up quantum error correction with two logical qubits
- Hit the breakeven point when logical quantum computing starts to outperform physical quantum computing
“Quantinuum has achieved some of the milestones required to accomplish this now,” Ryan-Anderson said.
Five-Qubit Code vs. Color Code
Building upon the 2021 research involving one logical qubit, the newest research illustrates the Quantinuum team’s progress with quantum error correction and two logical qubits. The team tested two error codes familiar to quantum experts: the Five-Qubit Code and the Color Code. The Five-Qubit Code does not allow for a fault tolerant transversal gate using only two logical qubits. Researchers used “pieceable” fault tolerance to decompose an initially non-fault tolerant logical gate operation into pieces that are individually fault-tolerant. The Color Code, however, does allow the use of a transversal CNOT gate which is naturally fault-tolerant.
How the experiment worked
H1-2 can use up to 12 qubits and H1-1 can use up to 20. The Five-Qubit Code tested on H1-2 while the Color Code tested on H1-1. Both computers use the same surface electrode ion trap to control ytterbium ions as qubits. Ion transport to isolated gate zones with focused laser beams provides low crosstalk gate and mid-circuit measurement operations.
The researchers ran five experiments with different combinations of circuit elements to test the Five-Qubit Code and to understand the impact of fault tolerant design and circuit depth. The team found that the extra circuitry designed to increase fault tolerance had a negative impact on the overall fidelity of the logical operation, due to the large number of CNOT operations required.
The Color Code showed much better results due in part to the ability to use a transversal CNOT gate. The team ran seven experiments to investigate the fault tolerant potential of these codes. With the Color Code, the researchers found that the State Preparation and Measurement circuits benefitted from the addition of fault tolerant circuitry with a significant reduction of error rates: 99.94% for the logical qubits compared to 99.68% for the physical qubits. This was the only additional circuitry required to make the circuit fault tolerant from end-to-end, since the logical CNOT is transversal and naturally fault tolerant.
The researchers concluded that the “relatively economical fault tolerant circuitry of the Color Code will provide a better platform for computation than the qubit efficient five-qubit code.” Also, the researchers found that the Five-Qubit Code would be useful only in systems with far lower physical error rates than quantum computers have at this point in time.
Hayes said the team’s next step will be to surpass the breakeven point and provide proof of the work. “We are getting evidence that we're really darn close to that point, but there's a lot of work that needs to be done to actually prove it,” he said. “Just getting right there is not good enough, you have to actually get past it.”
A new classical+quantum connection
Another advance from this experiment is a new classical processor with enhanced capabilities which will be essential to scalable algorithmic decoders. The data from the classical functions were used to dictate the control flow and operations executed in the quantum program.
The decoders used in these experiments were partially written in Rust and compiled to WebAssembly (Wasm). The choice of Wasm provides an efficient, safe, and portable classical language to have functions that are callable from quantum programs.
The decoder implemented in Rust uses many high-level program constructs. The support for these features means that various scalable algorithmic decoders can be ergonomically implemented in various high-level languages that compile to Wasm (such as Rust, C, and C++) and called from quantum programs.
“It was pretty enabling for this particular experiment, and it'll be even more important for future experiments as these things get more and more complicated,” Hayes said.
Another advantage of the trapped ion architecture is the ability to do real-time decision making during the execution of the quantum circuit thanks to long coherence times and the ability to do mid-circuit measurement and reset qubits as needed.
“Our systems have very long coherence times which is super advantageous when integrating in the classical compute real-time decision making,” Hayes said.
The Honeywell Trademark is used under license from Honeywell International Inc. Honeywell International Inc. makes no representations or warranties with respect to this product. This product is produced by Quantinuum.
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.
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
BROOMFIELD, CO, and LONDON, U.K. – February 4, 2025 – Quantinuum today announced a groundbreaking Generative Quantum AI framework (Gen QAI) – leveraging unique quantum-generated data to enable commercial applications in areas ranging from the development of new medicines, precise predictive modeling of financial markets and real-time optimization of global logistics and supply chains. The potential of these three capabilities alone is immense, and this framework is set to unlock solutions to other complex problems that classical computing cannot address.
For the first time, data generated by Quantinuum’s powerful H2 quantum computer can be harnessed to train AI systems, significantly enhancing the fidelity of AI models, 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.
“We are at one of those moments where the hypothetical is becoming real and the breakthroughs made possible by the precision of this quantum-generated data will create transformative commercial value across countless sectors. Gen QAI is a direct result of our full-stack capabilities and our leadership in hybrid classical-quantum computing, delivering an entirely new approach that stands to revolutionize AI,” said Dr. Raj Hazra, President and CEO of Quantinuum. On February 4, Dr. Hazra will join an expert panel at the 2025 International Year of Quantum (IYQ) ceremony in Paris to share further insights into our groundbreaking Gen QAI development.
“While some may suggest that a standalone quantum computer is still years away, the commercial opportunities from this breakthrough are here and now,” said Dr. Thomas Ehmer from the Healthcare business sector of Merck KGaA, Darmstadt, Germany. "The generation of meaningful synthetic data, specifically when you do not have many training data, is nontrivial and we see it as a new era for AI unlocked by quantum technologies. The Helios system, launching later this year will hopefully enable AI to be used in unprecedented ways and unlocking transformative potential across industries.”
Gen QAI leverages the unique capabilities of quantum computing to explore data complexities far beyond what classical computing systems and GPUs can handle. Quantinuum is collaborating with industry partners on Generative AI projects that harness the power of quantum computing in sectors such as automotive, pharmaceuticals and materials science. In the coming months, Quantinuum will share results from ongoing collaborations, showcasing the groundbreaking potential of quantum-driven advancements in Generative AI.
One notable collaboration is with the HPE Group in Italy, focusing on utilizing quantum computing in the automotive sector.
Enzo Ferrari, Executive Vice President of HPE Group, stated, “At HPE, we have a long-standing tradition of employing cutting-edge technologies for our clients in the motorsport industry. We are thrilled about our collaboration with Quantinuum, leveraging quantum-generated data for applications such as battery development, aerodynamic optimization and fuel innovation.”
As quantum computing gains significance globally, Quantinuum anticipates that its upcoming Helios system will exponentially extend computational capabilities, operational by mid-2025 for applications in drug discovery and addressing climate challenges. In particular, the innovative Gen QAI capability will enhance and accelerate the use of Metallic Organic Frameworks for drug delivery, paving the way for more efficient and personalized treatment options, with details to be unveiled at the launch of Helios.
This announcement also comes on the heels of Quantinuum’s recently expanded partnership with SoftBank, underscoring the company’s accelerating commercial momentum.
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
Source: SoftBank Corp.
Tokyo, Japan and Broomfield, Colorado, January 29th, 2025 — SoftBank Corp. ("SoftBank") and Quantinuum ("Quantinuum") announced they agreed to a wide-ranging partnership in quantum computing.
By combining their respective strengths, both companies will unlock innovative quantum computing solutions that will overcome the limitations of classical artificial intelligence (AI) and realize next-generation technologies.
This unique initiative coincides with the International Year of Quantum Science and Technology (IYQ) in 2025, and it is expected to ignite new business opportunities through the dynamic fusion of AI and quantum computing.
The Necessity of Quantum Computing Beyond the Limits of AI
In this modern era, AI is delivering impressive results across various domains. However, it is widely recognized that there are still significant challenges that AI alone is struggling to overcome. Complex optimization problems, deciphering causal relationship analysis, and conducting high-precision simulations based on fundamental equations remain formidable obstacles for current AI technologies.
Moreover, the hybrid approach that combines Central Processing Units (CPUs), Graphics Processing Units (GPUs), and Quantum Processing Units (QPUs) holds the potential to further extend the capabilities of AI. By leveraging the unique strengths of each type of processing unit, hybrid systems can execute more advanced and diverse computations, providing innovative solutions that surpass traditional limitations.
SoftBank and Quantinuum believe in the power of quantum computing and are committed to exploring its transformative potential.
Current State and Challenges of Quantum Computing
Despite impressive growth in the quantum computing sector, several technical and business challenges need to be addressed to advance the state-of-the-art so that quantum computers are used to solve practical problems.
(1) Building a Business Model
- Initial Investment and Operational Costs: The substantial initial investment and operational costs required for the development and deployment of quantum computers lack concrete cost recovery strategies, which in turn suppresses the drive for companies to develop and adopt the technology.
- Clarification of Revenue Models: The business models for generating revenue, including the methods of offering quantum computers and setting usage fees, have not yet been fully realized.
(2) Establishing Specific Use Cases
- Discovering Use Cases: There is a shortage of use cases that clearly demonstrate which fields quantum computers will be useful in. Understanding the market size and revenue models through clear examples, especially in areas such as quantum chemical calculations and machine learning, is necessary.
- Understanding the Market and Revenue Predictions: It is crucial to specifically identify the areas where computations can only be performed by quantum computers and are commercially viable, as well as to predict the timing and scale of these applications.
(3) Advancing Hardware and Software Technologies
- Limitations and Challenges of Hardware: The current hardware performance (number of qubits and operation precision) of quantum computers is inadequate for handling practical problems, and significant enhancements in performance are needed for practical use.
- Software Development and Error Mitigation: The development of hybrid algorithms that combine traditional methods, as well as advancements in error suppression, mitigation, and correction technologies, are essential to enable practical computations. Furthermore, developing technologies that mutually complement hardware and software are also indispensable.
- Timing for Service Provision: Making decisions based on a deep understanding of technology to provide services at the optimal timing requires assessing the speed of technological advancements and market needs.
Key Activities
SoftBank and Quantinuum are committed to addressing these challenges together to advance the practical application of quantum computers.
(1) Joint Market Research & Business Model Development for Quantum Data Center
- With a view toward the realization of a "quantum data center" capable of performing advanced calculation processing by combining CPUs, GPUs and quantum computers (QPUs), both companies will use the Japanese market as a foothold to conduct global market research in the Asia-Pacific region and other regions, and explore specific business models based on that research.
- Both companies will jointly consider methods to reduce investment risks, such as revenue sharing and cost sharing.
(2) Construction of Quantum Use-Case Timelines and Validation
- SoftBank will provide its own business challenges as use cases.
- Both companies will clarify use cases in quantum chemistry and network analysis, and construct a timeline showing when these use cases will be realized. In quantum chemistry, the search for new optical switch materials for All Optical Networks is anticipated, while in network analysis, the application to anomaly detection and fraud detection in SoftBank's communication network is envisioned.
- Both companies will develop software technology that makes effective use of limited hardware resources, and explore methods for linking CPUs, GPUs, and QPUs.
Comments from each company
Ryuji Wakikawa, Head of Research Institute of Advanced Technology, SoftBank Corp., commented: “SoftBank believes in the potential of quantum computers and has been testing and evaluating various internal issues using quantum computers, and has started to obtain certain results. However, as a telecommunications operator, there are still many challenges remaining regarding how to provide quantum computing services in Japan. Through our collaboration with Quantinuum, which possesses the world's highest-performance quantum computer hardware, we aim to be the first in the world to identify problems that can only be solved by quantum computers and look forward to significantly accelerating the practical application of quantum computing.”
Dr. Rajeeb Hazra, President and CEO of Quantinuum, commented: "Our partnership with SoftBank represents a pivotal moment in the evolution of quantum computing. By combining our strengths, we are poised to unlock innovative solutions that will not only enhance the capabilities of AI but also tackle challenges that have long been beyond reach. Together, we are laying the groundwork for a future where quantum technologies drive transformative advancements across multiple industries."
By integrating quantum computing with AI, this initiative is expected to contribute to problem-solving in diverse fields such as healthcare, finance, logistics, and energy. This collaboration not only addresses unsolved challenges but also creates new market opportunities and fosters technological innovation across society.
About SoftBank Corp.
Guided by the SoftBank Group’s corporate philosophy, “Information Revolution – Happiness for everyone,” SoftBank Corp. (TOKYO: 9434) operates telecommunications and IT businesses in Japan and globally. Building on its strong business foundation, SoftBank Corp. is expanding into non-telecom fields in line with its “Beyond Carrier” growth strategy while further growing its telecom business by harnessing the power of 5G/6G, IoT, Digital Twin and Non-Terrestrial Network (NTN) solutions, including High Altitude Platform Station (HAPS)-based stratospheric telecommunications. While constructing AI data centers and developing homegrown LLMs specialized for the Japanese language with one trillion parameters, SoftBank is applying AI to enhance radio access network performance (AI-RAN) with the aim of becoming a provider of next-generation social infrastructure.
To learn more, please visit https://www.softbank.jp/en/.
About Quantinuum
Quantinuum, the world’s largest integrated quantum computing company, pioneers powerful quantum computers and advanced software solutions. Quantinuum’s technology drives breakthroughs in materials discovery, cybersecurity, and next-gen quantum AI. With around 600 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.
- SoftBank, the SoftBank name and logo are registered trademarks or trademarks of SoftBank Group Corp. in Japan and other countries.
- Other company, product and service names in this press release are registered trademarks or trademarks of the respective companies.