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Scalable Quantum Coupling of Silicon-Donor Spin Qubits

Carlsbergfondets internationaliseringsstipendier


Quantum technologies and quantum computing are predicted to have revolutionary applications, by solving problems that are otherwise intractable even for the fastest classical supercomputers. A genuine quantum advantage, however, requires manufacturing and interconnecting millions of high-quality quantum bits. This project aims to demonstrate a scalable platform for coupling donor-based silicon qubits over long distances, providing the backbone for scaling up silicon-based quantum computers, as well as a rich platform for fundamental quantum science.


A fault-tolerant universal quantum computer is expected to consist of millions of high-quality quantum bits (qubits). A promising route is to adapt the manufacturing methods of the existing silicon nanoelectronic industry - capable of producing chips with billions of nanometer-scale silicon transistors at very low cost - to create spin-based qubits in silicon. For example, dopant atoms, commonly used to tune the electronic properties of semiconductors, act as natural two-level qubit systems.


To achieve long-range coupling of donor-based qubits, I plan to develop resonator system that is compatible with the existing silicon spin qubits. This is the first step in achieving a coupling between the spin of the qubit system and photons in the resonators, which will allow coherent coupling of spatially separated qubits. In achieving this, I can take advantage of my previous experience in developing high quality, magnetic field-resilient resonators for hybrid superconducting/semiconducting systems. Combined with the existing efforts in the group and the state-of-the-art nanofabrication facilities, I believe this can be achieved in the given timeframe.


Quantum technologies may be useful in finding new medical drugs, energy solutions or fertilisers by potentially allowing complex molecule simulations. This may open new directions, both commercially and in education with positive social implications.