Dopants in silicon appear as a key building block for quantum information processing as they can be used to store quantum information thanks to the long coherence time of the spin of the donor nucleus. Dopants also have the potential to serve as quantum nodes, providing interfaces between different quantum systems. The quantum state of their electron spins can be exchanged with their nuclear spins, or with microwave photons. The coupling to microwave photons brings about the tantalising opportunity to create a long-lived solid-state quantum memory for superconducting circuits which are particularly efficient at manipulating quantum information but so far lack the possibility to store it for long times.
In order to achieve such a spin memory for superconducting circuits, it is necessary to be able to transfer a qubit between the two systems much more rapidly than it decoheres in either system. The goal of this project is to create such an interface. Indeed this part is still missing and is of crucial importance to build scalable devices for quantum information. Fabrication of a scalable quantum device able to process quantum information and store the quantum information is of prime importance and would have a tremendous impact for various field of the society ranging from cryptography to simulation of complex systems for climate modeling, chemistry, …
The overall objectives for this project are to :
i) optimize dopants implantation in silicon,
ii) design, fabricate and characterize high-quality-factor tunable superconducting resonators able withstand magnetic field,
iii) build a setup to characterize spin-superconductor interaction,
iv) demonstrate coherent exchange.
