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A university quantum algorithms/computation course supplement based on Qiskit

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# Changes made Creation of Qiskit textbook Korean translation folder in the "main-ko" branch. # Justification

**Describe the issue** Some of the code cells in the Japanese translation of the textbook are outdated and might not work with the latest version of Qiskit. These files need...

good first issue
content bug
translation

**Describe the issue** Why we transform with the -i*Dagger(D)*D' part? **Describe what you expect to see* ![6_4_transform](https://user-images.githubusercontent.com/43704364/96859521-e4539c00-1461-11eb-9730-3554e4c06358.png)

content bug

**What should the reader gain from this new content?** Implementing Travelling Salesman problem using Quantum Phase Estimation and Quantum Coin Game. One can learn how to use QPE to solve...

New Content Suggestion

**Is your feature request related to a problem? Please describe.** In the [simple variational forms](https://qiskit.org/textbook/ch-applications/vqe-molecules.html#Simple-Variational-Forms) section of Simulating Molecules using VQE, a universal variational form circuit is given for the...

enhancement

# Changes made I applied **Option 1** that I proposed in issue #1056 with slight changes. I changed the image for the one qubit variational form to show *U* instead...

# Changes made Change the game engine to qisge, and update 'your first game demo'. # Justification Old game engine was to rubbish.

# Changes made I made a directory `spell` for spell check. `make spell` in the directory checks typos. I checked #1014 using this tool. The [output](https://gist.github.com/t-imamichi/56dd2dd489cfe9254dd088f0650b3556) of `make spell`. I...

Fix issue #888 # Changes made 1. Fixed calculation error in table 2, where the final state in the last row is |11>, without global phase. 2. Add subscripts to...

This pull request adds a new Notebook to the "Games & Demo" section of the Qiskit textbook. It is a game to explain Quantum Entanglement (#459 ). If any changes...