The Qbead: putting a qubit in everyone’s hands

Software Framework

Bachelor Thesis (2025)
Author(s)

A. Geuze (TU Delft - Electrical Engineering, Mathematics and Computer Science)

X.H. Chen (TU Delft - Electrical Engineering, Mathematics and Computer Science)

V.T. Hoogendijk (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Contributor(s)

Carlos Errando Herranz – Mentor (TU Delft - QID/Herranz Lab)

Nick van der Meijs – Graduation committee member (TU Delft - Signal Processing Systems)

Rudi Santbergen – Graduation committee member (TU Delft - Photovoltaic Materials and Devices)

Faculty
Electrical Engineering, Mathematics and Computer Science
More Info
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Publication Year
2025
Language
English
Graduation Date
24-06-2025
Awarding Institution
Delft University of Technology
Project
['EE3L11 Bachelor graduation project Electrical Engineering', 'Qbead']
Programme
['Electrical Engineering']
Faculty
Electrical Engineering, Mathematics and Computer Science
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Abstract

This thesis explores the development of the software framework for the Qbead. A physical representation of a quantum bit (qubit) designed to be held in the hand. Shaped as a sphere, the Qbead visualises the Bloch sphere from quantum mechanics, with internal LEDs that illuminate to display the qubit’s state. The main goal of the Qbead is to provide students with a more intuitive and accessible way to learn about quantum computing.

While the concept shows promise, the existing software framework lacks the necessary features to function as an effective educational tool. This project focuses on further developing the codebase to create a solid foundation for future use. By expanding the software and implementing quantum-related experiments, the Qbead can better support hands-on education in quantum mechanics.

The new classes are added to create a better framework for other functions. The X, Y, Z, and Hadamard single-qubit gates are implemented. 3 ways to detect input, rotating, shaking, and tapping have been added.
Some experiments are developed to show off the single-qubit gate functions and decoherence of the state.

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