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QDarts: A Quantum Dot Array Transition Simulator for finding charge transitions in the presence of finite tunnel couplings, non-constant charging energies and sensor dots

by Jan A. Krzywda, Weikun Liu, Evert van Nieuwenburg, Oswin Krause

Submission summary

Authors (as registered SciPost users): Jan Krzywda
Submission information
Preprint Link: https://arxiv.org/abs/2404.02064v3  (pdf)
Code repository: https://github.com/condensedAI/QDarts
Date accepted: 2024-10-08
Date submitted: 2024-10-01 05:38
Submitted by: Krzywda, Jan
Submitted to: SciPost Physics Codebases
Ontological classification
Academic field: Physics
Specialties:
  • Condensed Matter Physics - Experiment
  • Condensed Matter Physics - Theory
  • Quantum Physics
Approach: Computational

Abstract

We present QDarts, an efficient simulator for realistic charge stability diagrams of quantum dot array (QDA) devices in equilibrium states. It allows for pinpointing the location of concrete charge states and their transitions in a high-dimensional voltage space (via arbitrary two-dimensional cuts through it), and includes effects of finite tunnel coupling, non-constant charging energy and a simulation of noisy sensor dots. These features enable close matching of various experimental results in the literature, and the package hence provides a flexible tool for testing QDA experiments, as well as opening the avenue for developing new methods of device tuning.

Author comments upon resubmission

After addressing the issues raised by the reviewers, we have submitted a revised version of the manuscript and code, which includes new functionalities. We are grateful for the review process, as it has helped us achieve these improvements and provided valuable guidance for further development of the code.

List of changes

Most of the changes address the reviewers' suggestions (see response). The key changes are as follows:

Manuscript:
- A more detailed comparison between QDarts and other similar packages.
- Added colorbars to indicate parameters in the figures.
- Explanation of the odd-even parity effect for tunnel coupling.
Code:
- Implementation of the odd-even parity effect for tunnel coupling.
- Measurement of quantum capacitance via in-situ reflectometry (new example notebook).
- A new example notebook for the low-level interface.
- Updated documentation, including an improved installation guide and requirements.
- Overall improvements to the code structure and quality.

Current status:
Accepted in target Journal

Editorial decision: For Journal SciPost Physics Codebases: Publish
(status: Editorial decision fixed and (if required) accepted by authors)

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