Robert Johansson
Data Scientist
Chiba Prefecture, Japan
Summary
🤩
Rockstar🎓
Top SchoolRobert Johansson is a Data Scientist with 15 years of experience blending academic research and e-commerce analytics, currently applying advanced modeling and big-data techniques at Rakuten in Japan. He holds a Ph.D. in Physics from Chalmers University of Technology and previously conducted research at RIKEN, bringing rigorous quantitative and experimental instincts to industry problems. Robert is skilled in mathematical modeling, economics, and data engineering, and he routinely translates complex physical models into practical code. An active open-source contributor, he has improved and documented core features in the widely used QuTiP quantum toolbox and contributed tests and educational notebooks to SymPy and scientific-python lecture materials. Based in Chiba Prefecture, he combines deep theoretical knowledge with hands-on engineering, often surfacing physics-inspired insights—such as using quantum system simulation techniques—to enrich e-commerce data solutions.
15 years of coding experience
6 years of employment as a software developer
Doctor of Philosophy (Ph.D.), Physics, Doctor of Philosophy (Ph.D.), Physics at Chalmers University of TechnologySimon Fraser University
Swedish, English
Github Skills (22)
unit-testing10
quantum-mechanics10
computer-algebra10
python10
testing10
ipython10
mathematical10
photonics10
plot10
numpy10
latex10
qutip10
jupyter-notebook10
linear-algebra10
modeling10
Programming languages (5)
Github contributions (5)
jrjohansson/qutip-lectures
Oct 2012 - Aug 2021
Lectures on QuTiP: slides and ipython notebooks
Role in this project:
Data Scientist
Data ScientistContributions:90 commits, 1 PR, 3 pushes in 8 years 11 months
Contributions summary:Robert implemented a lecture on the application of QuTiP to solve problems related to the Kerr nonlinearities. They set up the core elements of a quantum system, defined the operators, and created a function to plot expectation values and variances to visualize dynamics. The user also explored a time evolution of the system to understand the physical behavior of the states under the Kerr Hamiltonian, and plotted the Wigner function.
ipythonqutip
qutip/qutip-notebooks
Sep 2013 - Jan 2017
A collection of IPython notebooks using QuTiP: examples, tutorials, development test, etc.
Role in this project:Back-end Developer
Back-end DeveloperContributions:68 commits, 2 PRs, 5 pushes in 3 years 4 months
Contributions summary:Robert's contributions primarily involve importing example notebooks for the QuTiP library and updating them. These notebooks appear to focus on implementing and demonstrating the use of the `smesolve` function for calculations in quantum optics, specifically showcasing the heterodyne detection method. The user also worked on examples for Bloch-Redfield master equation solvers, and other visualization tools, which highlights a focus on solving and understanding the underlying physics.
ipythonqutip
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