Cooper-par och stark spinn-foton koppling i artificiella ringmolekyler

We propose to investigate how electron spins residing within a new type of artificial molecule interact with microwave photons and superconductors, with relevance for spin-based quantum information processing.

We will focus on two primary topics (i) exploring mechanisms to enhance spin-photon interactions in solids, ultimately allowing entanglement of remote spins using microwaves (ii) generation and detection of entangled spins from split Cooper-pairs.

The research will be based on a new artificial ring molecule composed of coupled quantum dots (QDs), where the quantum states are unusually sensitive to external electric- and magnetic fields.

The QDs are formed by controlling the crystal structure of InAs nanowires during epitaxial growth, where a strong confinement provides extremely well-defined orbital- and spin-states.

We will specifically investigate how to couple the QDs to a superconductor, such that filtering of entangled spins from Cooper-pairs is possible.

We will also explore how to further enhance the electromagnetic response of the ring molecules by incorporating InAsSb alloys, with very narrow bandgap and strong spin-orbit interaction.

The proposed 4-year project will primarily involve electron transport studies at low temperature, and will receive support on semiconductor epitaxial growth and transport theory through existing collaborations.