Projektbeschreibung
Mit Hybrid-Qubits entscheidende Hürden bei der Realisierung eines universellen Quantencomputers überwinden
Das Wesen eines universellen Quantencomputers besteht darin, dass in ihm die volle Leistung eines klassischen Computers mit der eines Quantencomputers kombiniert wird und auf diese Weise die Simulation der Physik und aller Operationen eines klassischen Computers möglich werden. In einen Quantenpunkt oder in topologische Teilchen in Halbleitern eingebettete Elektronenspins lassen auf den Bau eines universellen Quanten-Logikgatters hoffen, das alle möglichen Operationen auf quantenmechanischer Ebene unterstützt. Beide stellen jedoch echte Herausforderungen dar. Das EU-finanzierte Projekt QUIST will beide Methoden vereinen, um jene Hürden zu überwinden, die dem Bau eines großmaßstäblichen Quantencomputers im Wege stehen. Ultimatives Ziel ist der Aufbau einer leistungsfähigen Plattform, auf der komplexe Systeme erschaffen, simuliert und berechnet werden können, um das allgemeine Verständnis der Physik zu vertiefen.
Ziel
The promise of universal quantum computation stems from the remarkable behaviour of quantum states and the challenge is to gain control over their fragile nature. In topological quantum computation, information can be encoded nonlocally on Majorana states to provide inherent protection against noise, but operation is restricted to the trivial Clifford group. Spins in quantum dots do provide universal logic, but interactions are short-ranged. I propose to study the question whether these platforms can be united to overcome their limitations as a path toward large-scale quantum computation.
The grand goal of this project is, therefore, to coherently transfer quantum information between spin and topological qubits. Our quantum material of choice is germanium, which can exhibit strong spin-orbit coupling, can provide long quantum coherence for single spins, and can make ohmic contacts to superconductors for hybrid superconductor-semiconductor systems. We will use two-dimensional germanium hetero structures and fabricate superconducting quantum dot devices. Qubits defined on the spin states of single holes will be electrically driven using the spin-orbit interaction and coupled through the exchange interaction. On linear chains of quantum dots we will pursue topological superconductivity, which we will consequently integrate in the spin qubit platform. We will then study their interaction to demonstrate controllable transfer of quantum information between hole spin and Majorana states.
This research is presently at a fundamental stage and is thereby bound to produce exciting results where new physics may arise. The choice of the materials platform and its compatibility with semiconductor manufacturing promises for a successful adoption as building block for future quantum technology. Our long-term dream is to create a powerful platform where complex and emerging systems can be created, simulated, and computed to advance our general understanding of physics.
Wissenschaftliches Gebiet
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computers
- natural sciencesphysical scienceselectromagnetism and electronicssemiconductivity
- natural scienceschemical sciencesinorganic chemistrymetalloids
- natural sciencesphysical scienceselectromagnetism and electronicssuperconductivity
Programm/Programme
Thema/Themen
Finanzierungsplan
ERC-STG - Starting GrantGastgebende Einrichtung
2628 CN Delft
Niederlande