Phys.org August 13, 2021
Advancing from the current few-qubit devices to silicon quantum processors with upward of a million qubits, as required for fault-tolerant operation, presents several unique challenges, one of the most demanding being the ability to deliver microwave signals for large-scale qubit control. Researchers in Australia have demonstrated a potential solution to this problem by using a three-dimensional dielectric resonator to broadcast a global microwave signal across a quantum nanoelectronic circuit. The technique uses only a single microwave source and can deliver control signals to millions of qubits simultaneously. They have shown that the global field can be used to perform spin resonance of single electrons confined in a silicon double quantum dot device, establishing the feasibility of this approach for scalable spin qubit control…read more. Open Access TECHNICAL ARTICLE
Device stack for off-chip ESR and DR simulations. Credit: Science Advances 13 Aug 2021,Vol. 7, no. 33, eabg9158