Objectif The realization of a topological superconductor (TS) and of Majorana fermion (MF) quasiparticles promises to open new avenues towards decoherence-robust topological quantum computing. However, further developments in this direction, including the investigation of their topological properties, have been hindered by the lack of a fully conclusive demonstration. In setups based on 1D nanostructures, e.g. semiconductor nanowires and magnetic adatom chains, this is linked to the difficulty to unambiguously assign the main reported signatures, a zero-bias peak in Andreev conductance, to MF modes. This proposal aims to overcome these limitations by exploring an alternative approach in which a 1D TS is built from the bottom up. In particular, arrays of proximity-coupled semiconductor quantum dots (QDs) will be explored as a platform for emulating the Kitaev chain. Such an approach offers the advantage that the evolution of subgap states into MF modes is followed during the assembly of the TS, thereby providing conclusive evidence of their realization. It also enables to controllably adjust the chain parameters to their optimal values where the topological array is most robust. Recent work from the PI addressed in detail the single QD limit of these arrays, where important milestones have been reached. These include the demonstration of spin-polarized subgap states that are the atomic precursors of topological chains and MF modes, and of the precise electrical control over the parameters of proximity-coupled QDs. Here, the PI aims to take the subsequent steps and study the assembly of these building blocks into a 1D TS. The main goals will be to:i) study the hybridization of subgap states into molecular levels as well as the spinless superconducting pairing in double QDs. This will shed light on the mechanisms involved in the formation of arrays;ii) show conclusive signatures of MF quasiparticles in a topological triple QD array;iii) study properties of MF modes. Champ scientifique natural sciencesphysical sciencestheoretical physicsparticle physicsfermionsengineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computersnatural sciencesphysical scienceselectromagnetism and electronicssemiconductivitynatural sciencesphysical scienceselectromagnetism and electronicssuperconductivity Mots‑clés TOPOQDot Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Thème(s) ERC-2016-STG - ERC Starting Grant Appel à propositions ERC-2016-STG Voir d’autres projets de cet appel Régime de financement ERC-STG - Starting Grant Institution d’accueil UNIVERSIDAD AUTONOMA DE MADRID Contribution nette de l'UE € 1 750 625,00 Adresse CALLE EINSTEIN 3 CIUDAD UNIV CANTOBLANCO RECTORADO 28049 Madrid Espagne Voir sur la carte Région Comunidad de Madrid Comunidad de Madrid Madrid Type d’activité Higher or Secondary Education Establishments Liens Contacter l’organisation Opens in new window Site web Opens in new window Participation aux programmes de R&I de l'UE Opens in new window Réseau de collaboration HORIZON Opens in new window Coût total € 1 750 625,00 Bénéficiaires (1) Trier par ordre alphabétique Trier par contribution nette de l'UE Tout développer Tout réduire UNIVERSIDAD AUTONOMA DE MADRID Espagne Contribution nette de l'UE € 1 750 625,00 Adresse CALLE EINSTEIN 3 CIUDAD UNIV CANTOBLANCO RECTORADO 28049 Madrid Voir sur la carte Région Comunidad de Madrid Comunidad de Madrid Madrid Type d’activité Higher or Secondary Education Establishments Liens Contacter l’organisation Opens in new window Site web Opens in new window Participation aux programmes de R&I de l'UE Opens in new window Réseau de collaboration HORIZON Opens in new window Coût total € 1 750 625,00
