Descrizione del progetto
Qubit ibridi per superare gli ostacoli principali alla realizzazione di un computer quantistico universale
L’essenza di un computer quantistico universale è la possibilità di combinare la piena potenza di un computer classico con quella di un computer quantistico, consentendo la simulazione della fisica e di tutte le operazioni di un computer classico. Le rotazioni di elettroni all’interno di un punto quantico o le particelle topologiche nei semiconduttori offrono la speranza di costruire una porta logica quantistica universale in grado di supportare tutte le possibili operazioni a livello di meccanica quantistica. Tuttavia, entrambe presentano delle sfide. Il progetto QUIST, finanziato dall’UE, mira a unire entrambi i metodi per superare gli ostacoli alla costruzione di un computer quantistico su larga scala. L’obiettivo finale è quello di costruire una potente piattaforma in cui i sistemi complessi possano essere creati, simulati e calcolati per far progredire la comprensione generale della fisica.
Obiettivo
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.
Campo scientifico
- 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
Programma(i)
Argomento(i)
Meccanismo di finanziamento
ERC-STG - Starting GrantIstituzione ospitante
2628 CN Delft
Paesi Bassi