Qedma and HQC2 Demonstrate Unprecedented Accuracy in Quantum Chemistry on Quantum Computers

Water molecule case study to be presented at Q2B Copenhagen 2026 shows how error mitigation can dramatically improve the reliability of quantum chemistry on today's processors

TEL AVIV, Israel and COPENHAGEN, Denmark, Sept. 9, 2026 /PRNewswire/ -- Qedma Quantum Computing, a pioneer in quantum error reduction software, together with the HQC² team at University of Copenhagen (KU), Denmark, Technical University of Denmark (DTU) and University of Southern Denmark (SDU), today published the findings of a collaborative study that delivered accurate quantum chemistry results, demonstrating the value of error mitigation in quantum computation. Qedma's researchers will be presenting this work and a separate talk on quantum advantage at Q2B Copenhagen, September 9-10, 2026.

In the study, researchers at HQC² and Qedma explored the potential energy surface of a water molecule using an orbital-optimized variational ansatz on IBM's Aachen quantum processor with Qedma's QESEM error reduction software. Led by Prof. Stephan P. A. Sauer and postdoctoral researcher Renato Olarte Hernandez at University of Copenhagen (KU), together with Prof. Sonia Coriani and postdoctoral researcher Emanuele Rossi at the Technical University of Denmark (DTU), the study was carried out as part of Q-CHEMION, a project under the Eureka open call for applied quantum technologies.

The research achieved exceptionally high accuracy for quantum computation, a 30–50× improvement over the raw results achieved without QESEM error mitigation.

Today's quantum processors are noisy, which can make quantum chemistry calculations unreliable and inaccurate. QESEM mitigates the impact of noise in current quantum computers. Rather than waiting for large-scale, fully fault-tolerant quantum computers, QESEM's patented approach unlocks the ability to execute larger and more complex quantum workloads while producing accurate results. It is currently being used by leading enterprises, academic institutions, and research laboratories around the world.

"We're extremely pleased with the results of this collaborative study that clearly illustrates how our error mitigation software can help bridge the gap between today's noisy quantum devices and the high-accuracy quantum computations required for future scientific applications," said Qedma CEO and Co-founder Dr. Asif Sinay. "The work shows a strong proof of concept for applying quantum computing to quantum chemistry on current hardware, demonstrating improved accuracy as higher levels of precision were required."

"Accuracy is particularly important in quantum chemistry, where even relatively small errors can affect the reliability of calculated molecular properties and energies," said Prof. Stephan P. A. Sauer, KU. "This study allowed us to explore how error mitigation can improve the accuracy of chemistry calculations performed on today's noisy quantum hardware. The results demonstrate the potential of approaches such as QESEM to help achieve the high levels of precision required for quantum chemistry applications."

Qedma recently demonstrated quantum advantage together with IBM, accurately resolving the dynamics of quantum materials unseen in classical simulation. The results marked the first time quantum advantage has been achieved with commercially available hardware and software, reaching a paradigm where multiple state-of-the-art classical approaches failed to provide consistent, reliable answers.

Qedma Presentations at Q2B Copenhagen

-  Quantum Advantage: Modeling Physics Beyond Classical Capabilities by Eyal Leviatan, Qedma, together with Prof. Stephan P. A. Sauer, KU, at 12:10 on September 9, 2026
-  Water Potential Energy Surface Study on a Quantum Computer with QESEM's High-Accuracy Error Mitigation by Renato Olarte Hernandez, KU, together with Tali Shnaider, Qedma, at 16:10 on September 10, 2026

About Qedma Quantum Computing

Qedma is accelerating the path to practical quantum computing by dramatically reducing the impact of hardware errors. Its hardware-agnostic software, QESEM, enables researchers and enterprises to run larger and more complex quantum algorithms while obtaining more accurate and reliable results on today's quantum computers. By overcoming one of the biggest barriers facing the industry, Qedma helps unlock scientific discoveries and enables users to push beyond the limits of current quantum hardware. Qedma was founded by Dr. Asif Sinay together with two prominent scientists: Prof. Dorit Aharonov, who thirty years ago proved that error corrected quantum computation is possible and laid the foundations of quantum fault tolerance, and Prof. Netanel Lindner, a world-renowned theoretical condensed matter physicist known for his work on complex quantum systems. For more information, visit www.qedma.com.

About HQC²

HQC² (https://hqc2.github.io/) is a collaboration research project funded by the Novo Nordisk Foundation, bringing together the research groups of Prof. Stephan P. A. Sauer (University of Copenhagen), Prof. Sonia Coriani (Technical University of Denmark), and Prof. Jacob Kongsted (University of Southern Denmark). HQC² specializes in the development of Quantum Chemistry algorithms and software designed to exploit the capabilities of NISQ and emerging early fault tolerant quantum computers. A key outcome of the project is the SlowQuant software package, which enables the calculation of ground- and excited-state energies as well as molecular spectroscopic properties, including UV/Vis, CD and NMR spin-spin coupling constants, on quantum computing platforms.

Qedma Media Contact:

Diane McKaye
Si14 Global Communications
[email protected]

SOURCE Qedma