Quantum circuits at ultralow temperatures: Exploring the fundamental limits of coherence in superconducting devices.

Project funded by Swedish Research Council (Project grant), grant 2019-05480_VR. Participating organisations named by the source: Chalmers University of Technology. Funded amount: SEK 3,200,000, as stated by the source. Runs 2020-01-01 to 2023-12-31. Keywords: Naturvetenskap, Natural Sciences, Data- och informationsvetenskap (Datateknik), Computer and Information Sciences, Datorteknik, Computer Engineering. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2025-12-05); national funding data, not CORDIS. Abstract given by the source: We plan experiments aiming at understanding sources of noise and decoherence in solid state devices, hampering the progress in construction of quantum computers. The quantum computer has to stand the ‘entropy’ challenge, telling that the states, involved in the calculation, should not be disturbed by the neighboring environment, destroying quantum coherence.There are at least two approaches to tackle the challenge: the complete isolation of the quantum bit (qubit) from the environment - in ‘cold atoms’ and ‘ion-based’ qubits, that, however, face the challenge of scalability - about 100 quantum bits have to be involved in a useful machine. The solid-state-based approach with the superconducting qubits provides a scalable quantum computer platform, but it suffers from the solid-state-specific 1/f noise, disturbing the computer performance, and questioning the scalability advantage.This project will answer the question, whether it is, in principle, possible to create a solid-state-environment to the qubit, which is similar to the vacuum, available to the atomic-science scientists.We propose cooling superconducting devices and supporting solid-state substrates to ultralow (below 1 mK) temperatures in the presence of high (around 6 T) magnetic fields, trying to freeze all possible sources of noise, down to the nuclear spins level, looking at decoherence.The project is based on our recent advances in the field and benefits from collaboration with the ultralow temperature experts.

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Swedish Research Council. Retrieved 2026-10-28. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: The project, funded by the Swedish Research Council with SEK 3,200,000, runs from January 1, 2020, to December 31, 2023, at Chalmers University of Technology. It aims to explore noise and decoherence in superconducting devices to advance quantum computing. Suggested technology pillar: computing. Generated by AI from the public source text; it may contain errors and the original source is authoritative.