Quantum Chemistry Progresses Meaningfully Towards a Fault Tolerant Regime Using Logical Qubits

In a major scientific first, quantum chemistry experts at Quantinuum have used a partially fault tolerant algorithm run on logical qubits to simulate the hydrogen molecule (H2)

July 12, 2023

Tokyo, Japan, Cambridge, UK, and Broomfield, Colorado, July 12th, 2023 — Quantinuum, the world’s largest quantum computing company, has become the first to simulate a chemical molecule by implementing a partially fault tolerant algorithm on a quantum processor using logical qubits. 

This essential step towards using quantum computers to speed up molecular discovery, with better modeling of chemical systems, reduces the time to generate commercial and economic value.

Quantinuum scientists, led from Japan, used three logical qubits on Quantinuum’s H1 quantum computer to calculate the ground state energy of the hydrogen molecule (H2) using an algorithm for early fault tolerant devices called stochastic quantum phase estimation.

It is already known that many algorithms that can be used on today’s “NISQ” era quantum computers will not scale to larger problems. The phase estimation technique used in this experiment with logical qubits has better potential to scale but is challenging to implement on today’s quantum computers because it requires very complex circuits, which are prone to failing due to noise. 

Dr. Raj Hazra, CEO of Quantinuum, said: “Today’s announcement turns a page for quantum chemistry on quantum computers, moving us towards the era of early fault tolerance. This achievement is testament to the dedication of the hardware and software teams at Quantinuum, who consistently demonstrate their ability to achieve world-class results. It was made possible thanks to the H1 quantum computer which brings together high-fidelity gate operations, all-to-all connectivity and conditional logic, with the truly world-leading algorithms, methods and error handling techniques offered by our InQuanto chemistry platform.”

In a scientific preprint paper, “Demonstrating Bayesian Quantum Phase Estimation with Quantum Error Detection”, the team of scientists led by Dr. Kentaro Yamamoto report they have overcome this challenge by creating and using logical qubits achieved with a newly developed error detection code designed for the H-series quantum hardware*. The code saved quantum resources by immediately discarding a calculation if it detected qubits that had produced errors during the computation process.

When combined with the low noise of the H-Series hardware and the capabilities of the Quantinuum Software InQuanto™, researchers were able to run these complex circuits for the first time, producing more accurate simulation results than those achieved without the error detection code. Creating and using logical qubits with error detection is a prerequisite for the more advanced error correction, which provides real-time protection for a quantum computer against various forms of “noise”.

Dr. Kentaro Yamamoto, Senior Researcher at Quantinuum, said: “Simulating the hydrogen molecule and getting such good results with logical qubits is an excellent experimental result and reminds us how fast we continue to progress. This result may reflect the start of a new chapter for quantum computing professionals, where we can begin to adopt partially fault tolerant algorithms on near-term devices, using all the techniques that will ultimately be required for future large-scale quantum computing.”

For scientific researchers and industrial enterprises in sectors such as healthcare, energy, automotive and manufacturing, who invest heavily in researching future molecules and materials, this demonstration implies that the time to useful quantum computing continues to get nearer.

This demonstration, which was run on Quantinuum’s System Model H1 quantum computer, Powered by Honeywell, will be integrated into future versions of its industry-leading quantum computational chemistry platform, InQuanto, allowing industrial companies and academic researchers to explore the use of partially fault-tolerant algorithms run on quantum computers for material and molecular modeling.

* For more information about the error detection code, see “Protecting Expressive Circuits with a Quantum Error Detection Code”

About Quantinuum

Quantinuum is the world’s largest 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. The Honeywell trademark is used under license from Honeywell International Inc. Honeywell makes no representations or warranties with respect to this service.

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. 

November 6, 2025
Quantinuum Selected by DARPA to Advance to Stage B of Quantum Benchmarking Initiative

With the industry's most advanced quantum systems and proven ability to scale, Quantinuum is on track to deliver utility-scale quantum computing by early 2030s 

November 6, 2025 – Broomfield, CO – Quantinuum, the world leader in quantum computing, has been selected by the Defense Advanced Research Projects Agency (DARPA) as a contractor to advance to Stage B of DARPA’s Quantum Benchmarking Initiative (QBI).

DARPA is using QBI to evaluate the technical likelihood that a utility scale quantum computer will be available no later than 2033. A multi-stage program, Stage B follows a six-month Stage A effort in which Quantinuum developed and delivered a detailed concept design for a utility scale system called “Lumos.” 

Last year, Quantinuum released its public roadmap through the end of the decade with Apollo—a universal, fully fault-tolerant quantum computer—scheduled for launch in 2029. Lumos is a new addition to the roadmap as Quantinuum outlines plans to develop increasingly larger systems into the 2030s. 

“This selection recognizes the strength and maturity of our roadmap and the work our teams have already delivered,” said Dr. Rajeeb Hazra, President and CEO of Quantinuum. “Lumos extends our roadmap into the next decade and gives DARPA a concrete, de-risked path for achieving utility-scale quantum computing by 2033. We look forward to partnering with DARPA and our ecosystem partners to advance this important national objective.”

Stage B will be a year-long, performance-based evaluation by DARPA’s Test and Evaluation team in which Quantinuum will develop a detailed R&D roadmap for Lumos to validate technical assumptions, verification methods, and scaling plans to meet the 2033 objective.

Yesterday, Quantinuum deployed its latest generation system, “Helios,” on schedule with its roadmap. With the highest fidelity physical qubits and logical qubits of any commercial system, and a next-generation software stack featuring a modern, high-level programming language, Helios is designed to accelerate quantum computing adoption. The system has already been used to simulate high-temperature superconductivity and magnetism at unprecedented scales—two applications with relevance to critical, industrial utility.  

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 630 employees, including 370+ scientists and engineers, across the US, UK, Germany, and Japan, are driving the quantum computing revolution.

For more information, please visit www.quantinuum.com

This is some text inside of a div block.
All
This is some text inside of a div block.
All
This is some text inside of a div block.
All
November 5, 2025
Singapore’s National Quantum Office and Quantinuum Forge Strategic Partnership to Accelerate Quantum Computing

New collaboration to position Singapore as a leading global hub for quantum computing

Quantinuum to bring state-of-the-art Helios quantum computer to Singapore in 2026 and establish R&D and Operations Centre to advance talent development and commercial innovation

Singapore, November 6th, 2025 – Singapore’s National Quantum Office (NQO), a national platform hosted by the Agency for Science, Technology and Research (A*STAR), and Quantinuum, the world’s leading quantum computing company, today announced a strategic partnership to accelerate quantum computing in Singapore. 

The partnership marks a key milestone under Singapore’s National Quantum Strategy, led by NQO, and will advance quantum hardware, software and talent development through Singapore’s National Quantum Computing Hub (NQCH). The NQCH and Quantinuum will work together to strengthen Singapore’s position as a top global quantum computing hub, accelerate innovation with industry users across pharmaceuticals, materials science and finance, and nurture world-class talent. 

Singapore to Become First Country Outside of the United States to Host the World-Class Quantinuum Helios System

The installation of the Helios system in Singapore, expected to be completed in 2026, will give researchers direct access to Quantinuum’s Helios computing capabilities, supporting deeper research collaboration and innovation. Effective immediately, researchers will gain cloud access to Helios that enables key research and capability building.

As a full-stack offering, Helios is one of the most advanced commercial quantum computers today. The Helios platform unites a fully connected physical and logical qubit architecture with industry-leading fidelity and a next-generation software stack featuring a modern, high-level programming language, Helios is designed to accelerate quantum computing adoption.

Deepening Collaboration through Quantinuum’s R&D and Operations Centre in Singapore

Quantinuum will establish a new R&D and Operations Centre in Singapore to collaborate with Singapore’s research and innovation ecosystem. The Centre will serve to unify Quantinuum staff and local researchers and industry partners in co-developing end-to-end middleware and applications that bridge classical and quantum systems. Through these efforts, the Centre aims to accelerate the translation of quantum technologies into commercially relevant solutions, while building long-term R&D capabilities in quantum computing and its applications.

Strengthening Singapore’s Quantum Ecosystem through Industry Collaboration and Talent 

The partnership will foster a thriving quantum ecosystem in Singapore through industry programs and talent development. These include internships and co-organized workshops and conferences to accelerate skills transfer and build a strong pipeline of quantum specialists.

Quantinuum will collaborate with industry end-users in Singapore to co-develop advanced quantum computing applications that address real-world challenges. Initial programs under the strategic partnership will target areas such as:

  1. Computational biology, bioinformatics, and drug discovery
  2. Financial modeling and optimization 
  3. Advanced materials and chemistry
  4. Combinatorial optimization

Collectively, the initiatives aim to nurture a community of researchers, engineers and developers equipped to advance quantum computing and strengthen collaboration across Singapore’s research and industry ecosystem.

A Strategic Journey of Collaboration between Singapore and Quantinuum
  • Mr. Ling Keok Tong, Executive Director of the National Quantum Office: “This partnership marks an important step in building Singapore as a leading quantum computing hub. Through the National Quantum Computing Hub, we are advancing quantum-enabled applications in sectors such as healthcare, materials science, and finance. Working with Quantinuum will accelerate this progress, deepen local capabilities, and position Singapore as a leading quantum computing hub in the region, driving real-world outcomes.”
  • Dr. Rajeeb Hazra, President & CEO of Quantinuum: “Singapore has demonstrated remarkable foresight in recognizing the transformative power of quantum computing in this next phase of technological progress. Quantinuum is proud to work in partnership with Singapore to advance the frontiers of quantum computing, providing direct access to the most powerful computational capabilities ever developed. Together, we’re strengthening a hub that will accelerate the commercialization of quantum computing, enabling industries to rapidly turn breakthrough technology into real-world solutions.” 
  • Mrs. Josephine Teo, Minister for Digital Development and Information, and Minister-in-Charge of Cybersecurity & Smart Nation Group: “Singapore continues to invest significantly in quantum to strengthen our digital growth and security. We do this by collaborating with global partners on frontier tech, developing, and attracting world-class talents, and uplifting our local workforce and enterprises. Together, we hope to shape a more prosperous and safe future for Singapore and the world – where technology serves the public good.”

This strategic partnership builds on Quantinuum’s ongoing collaboration with Singapore’s quantum ecosystem, following two earlier agreements inked in 2024. These collaborations, which also involved the A*STAR Bioinformatics Institute (A*STAR BII) and Duke-NUS Medical School, laid the groundwork for this next phase of collaboration.

For media queries and clarifications, please contact: 

Quah Sheryl
Agency for Science, Technology and Research (A*STAR)
Corporate Communications
Mobile: +65 9113 7937
Email: Sheryl_Quah@a-star.edu.sg

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 630 employees, including 370+ scientists and engineers, across the US, UK, Germany, and Japan, are driving the quantum computing revolution. For more information, please visit www.quantinuum.com

Quantinuum Helios, Powered by Honeywell, reflects that the Helios ion trap was manufactured by Honeywell. The Honeywell trademark is used under license from Honeywell International, Inc. Honeywell makes no representations or warranties with respect to this service. 

About the National Quantum Office

The National Quantum Office (NQO) was established with the support of the National Research Foundation (NRF) to drive the development and implementation of the Research, Innovation and Enterprise (RIE) strategy for Quantum in Singapore. The Office was set up in April 2022 and is hosted by A*STAR, the Implementing Agency for Quantum. NQO, as a control tower, supports fundamental and translational research in Quantum through various strategic programmes that it oversees. It partners both public and private sectors to create a vibrant RIE quantum ecosystem in Singapore. For more information, visit https://nqo.sg.

About the National Quantum Computing Hub

The National Quantum Computing Hub (NQCH) is Singapore’s national initiative for advancing quantum software and applications. The hub is building foundational capabilities, providing access to quantum computers, and driving public-private partnerships. 

NQCH pursues practical quantum advantage across high-impact fields, including quantum chemistry, computational biology, finance and optimisation. The Hub also runs a programme to develop talent for the emerging quantum industry.

NQCH is a joint effort by Singapore’s Centre for Quantum Technologies (CQT), A*STAR Institute of High Performance Computing (A*STAR IHPC), and the National Supercomputing Centre (NSCC) Singapore.

For more information, visit: nqch.sg 

This is some text inside of a div block.
All
This is some text inside of a div block.
All
This is some text inside of a div block.
All
November 5, 2025
Quantinuum Announces Commercial Launch of New Helios Quantum Computer that Offers Unprecedented Accuracy to Enable Generative Quantum AI (GenQAI)

Helios launches with customers Amgen, BMW Group, JPMorganChase, and SoftBank Corp.

New York City, November 5, 2025 – Quantinuum, the world leader in quantum computing, today announced the launch of Helios, the world’s most accurate general-purpose commercial quantum computer, designed to accelerate quantum computing adoption by enterprises. With the highest fidelity of any commercial system and a first-of-its-kind real-time control engine, Helios enables developers to program a quantum computer in much the same way they program heterogeneous classical computers. A new, modern Python-based programming language called Guppy allows developers to seamlessly combine hybrid compute capabilities — quantum and classical — in a single program. Helios is now available to customers through Quantinuum’s cloud service and on-premise offering. 

“The next computing inflection point starts today,” said Dr. Rajeeb Hazra, President & CEO of Quantinuum. “For the first time enterprises can access a highly accurate general purpose quantum computer to drive real world impact, transforming how industries innovate – from drug discovery to finance to advanced materials.”

Helios unlocks the ability to enhance GenAI models with quantum generated data, thereby unlocking AI’s full potential in areas such as data analysis, material design, and quantum chemistry. To accelerate GenQAI, Quantinuum is expanding its partnership with NVIDIA, integrating NVIDIA GB200 with Helios via NVIDIA NVQLink to create applications for targeted end markets. In addition, Quantinuum will switch to NVIDIA accelerated computing for Helios and future systems, using Quantinuum Guppy alongside the NVIDIA CUDA-Q platform to perform real-time error correction critical to its roadmap.

Quantinuum announced a growing community of early users and collaborators, including leaders in life sciences, materials, and energy sectors: 

  • Amgen: an investor and research collaborator, exploring hybrid quantum-machine learning to advance data-driven discovery in biologics.
  • BlueQubit: AI image recognition using real-world driving video data. 
  • BMW Group: advancing sustainable mobility through materials research on fuel cell catalysts.
  • JPMorganChase: researching potential capabilities for advanced financial analytics.
  • SoftBank Corp.: exploring organic materials for next-gen batteries, optical switches, and solar cells.

Today, Quantinuum also signed a strategic partnership agreement with Singapore’s National Quantum Office (NQO) and National Quantum Computing Hub (NQCH) that includes access to Helios in country to accelerate commercial applications of quantum computing in the areas of computational biology and bioinformatics, financial modeling and optimization, advanced materials and chemistry, and combinatorial optimization. To support this strategic partnership, Quantinuum is establishing a world-class R&D and Operations Centre in Singapore. 

Finally, as part of its strategy to expand the commercial reach of quantum computing, Quantinuum is introducing two new ecosystem programs. Q-Net, a new user group, will serve as a forum for customer feedback and collaboration, while a new startup partner program will invite developers to build and scale third party applications on Helios.  

A blog post with more details on Helios can be read here. Visual assets and scientific papers can be downloaded here.

Fidelity: In quantum computing, fidelity is a metric that determines the accuracy of system’s computation. The lower a system’s error rate, the higher its fidelity. Helios has the highest fidelities ever released to the market. Its key performance specifications are outlined below:

  • Physical qubits (PQ): 98 PQ at 99.921% 2-qubit gate fidelity, and 99.9975% 1-qubit gate fidelity. 
  • Logical qubits (LQ)
    • 94 LQ (error detected) globally entangled with better than physical performance; 
    • 50 LQ (error detected) with better than physical performance in a magnetism simulation; and 
    • 48 LQ (error corrected) with better than physical performance (99.99% state prep and measurement fidelity).
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 630 employees, including 370+ scientists and engineers, across the US, UK, Germany, and Japan, are driving the quantum computing revolution. For more information, please visit www.quantinuum.com.

Quantinuum Helios, Powered by Honeywell, reflects that the Helios ion trap was manufactured by Honeywell. The Honeywell trademark is used under license from Honeywell International, Inc. Honeywell makes no representations or warranties with respect to this service. 

This is some text inside of a div block.
All
This is some text inside of a div block.
All
This is some text inside of a div block.
All