Single electron charge shuttling in a linear quantum dot array*

Recent advances in silicon spin qubits have pushed single qubit fidelities beyond 99.9% [1,2] and have lead to the realization of two-qubit gates based on exchange coupling [3-6]. In order to advance spin qubits to the next level of technological complexity, it is important to start investigating how to scale up to larger multi-component architectures. These architectures must allow for arbitrary coupling of spatially separated qubits, demanding the development of inter-qubit quantum state transfer procedures. Here we demonstrate shuttling of a single electron across a linear array of 9 series-coupled Si quantum dots in ~50 ns with an approach that is extendable to larger quantum dot arrays.

[1] Yang et al., arXiv:1807.09500
[2] Yoneda et al., Nat. Nanotech. 13, 102 (2018)
[3] Veldhorst et al., Nature 526, 410 (2015)
[4] Zajac et al., Science 359, 439 (2018)
[5] Watson et al., Nature 555, 633 (2018)
[6] Huang et al., arXiv:1806.02858