Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal 1- and 2-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We surprisingly observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity ≈ 93%, and concurrence 0.91 ± 0.08. These results form the necessary basis for scaling up donor-based quantum computers., , , # Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

[https://doi.org/10.5061/dryad.w3r2280zm](https://doi.org/10.5061/dryad.w3r2280zm)

This is accompanying data for the journal article 'Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits' ([https://arxiv.org/abs/2309.15463](https://arxiv.org/abs/2309.15463)).

**Outline of the dataset**

The dataset consists of the following:

* 'Main text' - folder containing the data used to produce the figures in the main text. This data is divided into subfolders according to the figure in the main text that the data is associated with.
* 'Supplementary material'- folder containing the data used to produce the figures in the supplementary material. This data is divided into subfolders according to the figure in the supplementary material that the data is associated with.
* 'GST' - folder containing the raw and processed data used to produce the GS...