Schrödinger cat states of a nuclear spin qudit in silicon

High-dimensional quantum systems are a valuable resource for quantum information processing. They can be used to encode error-correctable logical qubits, for instance in continuous-variable states of oscillators such as microwave cavities or the motional modes of trapped ions. Powerful encodings include ‘Schrödinger cat’ states, and superpositions of widely displaced coherent states, which also embody the challenge of quantum effects at the large scale. Alternatively, recent proposals suggest encoding logical qubits in high-spin atomic nuclei, which can host hardware-efficient versions of continuous-variable codes on a finite-dimensional system. Here we demonstrate the creation and manipulation of Schrödinger cat states using the spin-7/2 nucleus of a single antimony (123Sb) atom, embedded and operated within a silicon nanoelectronic device. We use a coherent multi-frequency control scheme to produce spin rotations that preserve the SU(2) symmetry of the qudit, and constitute logical Pa..., , , # Creation and manipulation of Schrodinger cat states of a nuclear spin qudit in silicon

This is accompanying data for the journal article 'Creation and manipulation of Schrodinger cat states of a nuclear spin qudit in silicon' ([https://arxiv.org/abs/2405.15494)](https://arxiv.org/abs/2405.15494\))

**Outline of the dataset**

The dataset consists of the following

* paper_data - folder containing the data used to produce figures in the main text, divided into subfolders according to the date that the data was taken
* Sb_Main - Jupyter notebooks to evaluate the data and make the figures for the main text. For each figure of the main text, a separate notebook is stored in the corresponding folder. E.g. 'Figure 3 - Cat state creation' contains the notebook to evaluate the data and create the plot for figure 3.
* PlottingHelper.py - Functions that are imported in each notebook to facilitate fitting curves
* 'Supplementary' - folder containing data used to produce figures of the s...