Coherent electron transport in silicon quantum dots

Understand

With silicon being the go-to material for spin qubits, and motivated by the demand of a scalable quantum computer architecture for fast and reliable quantum information transfer on-chip, we study coherent electron transport in a silicon double quantum dot.

• We first examine the valley-orbital dynamics in a silicon double dot, and discuss how to properly measure the tunnel couplings as well as the valley phase difference between two quantum dots.
• We then focus on possible phase and spin flip errors during spin transport across a silicon double dot.
• In particular, we clarify correction on the effective $g$-factor for the electron spin from the double dot confinement potential, and quantify the resulting phase error.