Observation of disorder-induced decoherence for individual electron spins in moving quantum dots

Controlled electron displacement has been identified as one possible strategy to convey on-chip quantum information in semiconductor quantum circuits. Understanding the mechanisms limiting the transfer fidelity is therefore an important task to validate this quantum information conveyer procedure.

In this presentation, we demonstrate the observation of disorder-induced decoherence for individual electron spins in moving quantum dots. Using our ability to transfer individual electrons on fast timescales with an unprecedented control [1, 2], we study the mechanisms affecting the spin coherence during the electron displacement. We demonstrate that the main source of decoherence is a combination of Coulomb disorder and spin-orbit coupling, and study its fluctuations over milliseconds timescales.

[1] Bertrand, B., Hermelin, S., Takada, S. et al. Fast spin information transfer between distant quantum dots using individual electrons. Nature Nanotech 11, 672–676 (2016).

[2] Jadot, B., Mortemousque, PA., Chanrion, E. et al. Distant spin entanglement via fast and coherent electron shuttling. Nat. Nanotechnol. 16, 570–575 (2021).