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 - [Introduction to Quantum Computing](https://home.cern/news/announcement/computing/online-introductory-lectures-quantum-computing-6-november) - Online introductory lectures on quantum computing by CERN (European Organization for Nuclear Research).
 - [John Preskill's Notes on Quantum Computation](http://www.theory.caltech.edu/~preskill/ph219/index.html#lecture) - Notes of Caltech's Quantum Computation Course Physics 219/Computer Science 219 by John Preskill.
 - [Nielsen and Chuang](https://workedproblems.wordpress.com/category/nielsenchuang/) - Worked examples on quantum algorithm problems.
+- [Q-CTRL Black Opal](https://q-ctrl.com/black-opal) - An interactive platform for learning the fundamentals of quantum computing.
 - [Qiskit Tutorials](https://github.com/Qiskit/qiskit-tutorial) - Jupyter notebooks simply demonstrating how to use Qiskit.
 - [Quantum Algorithm Implementations for Beginners](https://arxiv.org/pdf/1804.03719.pdf) - A brif survey of 20 different quantum algorithms using qiskit.
 - [Quantum Algorithm Zoo](http://math.nist.gov/quantum/zoo/) - Comprehensive catalog of quantum algorithms.