European supercomputer to be built with the participation Hungarian top university

The project named Open Superconducting Quantum Computers was launched on March 1 uniting 28 research partners from 10 European countries aiming to develop a 1000 qubit quantum computer.

Of Hungary’s science institutes, the Faculty of Natural Sciences of the Budapest University of Technology and Economics (BME TTK) and the Wigner Research Centre for Physics participate in the OpenSuperQPlus project contributing to the development of the quantum computer by providing theoretical support. These two institutions will be involved in the development of various methods for quantum error correction and fault tolerant computations and also in the design of the software programmes necessary for the operation of the quantum computer. On behalf of BME, the research activities will be supervised by János Károly Asbóth and András Pályi, associate professors from the Department of Theoretical Physics of the Faculty of Natural Sciences, bme.hu wrote.

The seven-year-long cooperation of the project planned to last until 2030 strongly relies on the contributions of the research teams with the expected outcome of the development of a 1000 qubit quantum computer. In the first phase of 3.5 years, the consortium is developing several systems for evaluating hardware and software as well as initially a 100-qubit quantum computer for special applications. In the second phase of the project, the scientists will work on the critical components of the 1000-qubit quantum computer and determine the technology directions of advanced development. This project is anticipated to trigger major changes in the chemical industry, material science, optimisation challenges and machine learning.

‘We are bringing together European specialists for all the components of such a quantum computing system under a unified framework – be they in the public or private sector. The technological challenge of beating errors in quantum computers and scaling them up needs all hands on deck from the outstanding quantum ecosystem in Europe, stressed Frank Wilhelm-Mauch, coordinator of the German Frank Wilhelm-Mauch of Forschungszentrum Jülich talking about the objective of the cooperation.

The OpenSuperQPlus project received funding of EUR 20 million from the European Union’s Horizon Europe thematic programme. For the first phase of the project, BME’s Faculty of Natural Sciences receives funding of EUR 274000 to be spent on scientific research activities by the participants.

Bme.hu interviewed János Asbóth, associate professor of the Department of Theoretical Physics and senior research fellow of the Wigner Research Centre for Physics about the project. Here is the interview unchanged:

BME: We hear a lot about quantum computers these days. What type of quantum computers are already used in the world?

János Asbóth: As this technology is still in its infancy, only quantum computer prototypes are now available, which work on low qubits and with fairly noisy parts. For the time being, even the most advanced hardware still uses superconducting circuits while quantum computers working with atoms floating in vacuum are also promising. Both American and European tech giants and startups have built around 100-qubit computers based on these hardwares. The best today are probably the quantum computers of IBM and Google, both based on superconducting circuits. Google’s 72-qubit chip is fairly reliable and fast while IBM successfully integrated 433 quantum bits on a chip although its reliability is probably significantly poorer. In academia, Open in the name of the project refers to open development, one of the most outstanding superconducting quantum computers was built by ETH in Zurich and while it is only 17-qubit, this is the first device with which quantum error correction was achieved with repeated measurements. This development was part of the OpenSuperQ project, which is now continued under the name OpenSuperQPlus.

BME: How are the Hungarian partners involved in the new project?

János Asbóth: The Wigner Research Centre and BME TTK will contribute to the success of the project with theoretical research. On the one hand, they are studying what algorithm procedures may be used to improve the reliability of the quantum computer prototype(s) to be built. On the other hand, they are examining what tasks can already be processed by these prototypes including quantum chemistry computations but also certain components of machine learning.

BME: When you say their reliability needs to be improved, you mean that they are not reliable enough, they can make errors?

János Asbóth: Today’s quantum computer prototypes contain a low number of quantum bits and are very unreliable. Quantum bits are prone to lose their quantum properties even when they are left alone. And we not only do not leave them alone but run various operations on them, which involve errors in the magnitude of tenth of a percent. On top of this, the readout error of the bits of quantum computers is also very high, around 1 to 2%. The improvement of their reliability is a huge technical challenge where software and statistical means can also be helpful. This is where BME offers its contribution to OpenSuperQPlus: we are developing algorithm solutions that can help reduce the impact of the noise generated by quantum computers.

BME: How unreliable are they? Is there a reference computer or are their calculations compared with those of traditional computers?