Nearest-neighbor coupling asymmetry in the generation of cluster states

TL;DR

This paper investigates the anisotropic nature of charge-qubit cluster state generation via capacitive coupling in a rectangular lattice and proposes biasing techniques to mitigate this asymmetry.

Contribution

It reveals the anisotropic coupling in charge-qubit cluster state generation and introduces biasing methods to improve uniformity.

Findings

Charge-qubit cluster state generation is anisotropic.

Applying potential biases can reduce coupling asymmetry.

Rectangular lattice coupling differs horizontally and vertically.

Abstract

We demonstrate that charge-qubit cluster state generation by capacitive coupling is anisotropic. Specifically, horizontal vs vertical nearest-neighbor inter-qubit coupling differs in a rectangular lattice. We show how to ameliorate this anisotropy by applying potential biases to the array of double dots.