Descripción del proyecto
Los cubits híbridos salvan obstáculos clave para hacer realidad un ordenador cuántico universal
La esencia de un ordenador cuántico universal es que combina toda la potencia de un ordenador convencional con la potencia de un ordenador cuántico, lo que permite realizar simulaciones de física y todas las operaciones de un ordenador convencional. Los espines de los electrones incrustados en un punto cuántico o las partículas topológicas de los semiconductores ofrecen esperanzas para la creación de una puerta lógica cuántica universal que admita todas las operaciones posibles a escala de mecánica cuántica. Sin embargo, ambos plantean retos. El proyecto QUIST, financiado con fondos europeos, tiene por objeto unir ambos métodos para salvar los obstáculos que impiden la construcción de un ordenador cuántico a gran escala. El objetivo final es construir una plataforma potente en la que se puedan crear, simular y calcular sistemas complejos para aumentar el conocimiento general de la física.
Objetivo
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.
Ámbito científico
- 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
Programa(s)
Régimen de financiación
ERC-STG - Starting GrantInstitución de acogida
2628 CN Delft
Países Bajos