Description du projet
Calcul quantique évolutif basé sur les états liés des supraconducteurs
Le projet AndQC, financé par l’UE, a pour objectif de jeter les bases d’une plate-forme à semi-conducteurs à l’état solide radicalement nouvelle pour l’informatique quantique évolutive, basée sur les qubits d’Andreev. Cette plateforme utilise le spin unique et la charge piégés dans des niveaux de quasi-particules supraconductrices discrètes (niveaux d’Andreev) dans les liaisons faibles entre les supraconducteurs. La flexibilité et l’évolutivité potentielles de la plate-forme à semi-conducteurs à l’état solide proposée dépendra de l’utilisation de nanofils semi-conducteurs de haute qualité et d’hétérostructures planaires ainsi que de conducteurs supraconducteurs propres. Les travaux s’étendent de la modélisation théorique des dispositifs et de la science des matériaux au transport quantique et aux mesures de bits quantiques, et ces divers aspects seront couverts par le large éventail de compétences du consortium.
Objectif
Our goal is to establish the foundations of a radically new solid state platform for scalable quantum computation, based on Andreev qubits. This platform is implemented by utilizing the discrete superconducting quasiparticle levels (Andreev levels) that appear in weak links between superconductors. Each Andreev level can be occupied by zero, one, or two electrons. The even occupation manifold gives rise to the first type of Andreev qubit, which has recently been demonstrated by some of the consortium members. We will characterize and mitigate the factors limiting the coherence of this qubit to promote these proof of concept experiments towards a practical technology. The odd occupation state gives rise to a second type of qubit, the Andreev spin qubit, with an unprecedented functionality: a direct coupling between a single localized spin and the supercurrent across the weak link. Further harnessing the odd occupation state, we will investigate the so far unexplored scheme of fermionic quantum computation, with the potential of efficiently simulating electron systems in complex molecules and novel materials. The recent scientific breakthrough by the Copenhagen node of depositing of superconductors with clean interfaces on semiconductor nanostructures opened a realistic path to implement the Andreev qubit technology. In these devices, we can tune the qubit frequency by electrostatic gating, which brings the required flexibility and scalability to this platform. We will demonstrate single- and two-qubit control of Andreev qubits, and benchmark the results against established scalable solid-state quantum technologies, in particular semiconductor spin qubits and superconducting quantum circuits. To carry out this research program, we rely on the instrumental combination of experimentalists, theorists and material growers, together having the necessary expertise on all aspects of the proposed research.
Champ scientifique
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computers
- natural sciencesphysical scienceselectromagnetism and electronicssemiconductivity
- natural sciencesphysical scienceselectromagnetism and electronicssuperconductivity
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RIA - Research and Innovation actionCoordinateur
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