The "ATOM" Museum features a unique space - the "Quantum Classroom". Every guest can conduct real physical experiments using the latest scientific equipment and understand the laws of the micro-world. The "Quantum Classroom" at the "ATOM" Museum is a new type of scientific space open to everyone. Here, participants can fully immerse themselves in the world of quantum technologies, using a practical format: conducting experiments with the most modern equipment. Quantum physics becomes accessible to everyone here. In the new masterclass "Polarization: from 3D Cinema to Quantum Cryptography", high technologies become understandable, and the scientific principles underlying them are embodied in real experiments. Each participant will be able to: Understand the laws of the quantum world by independently conducting physical experiments on an optical table. Understand the structure of modern 3D cinemas and find out what polarizing glasses have in common with advanced information protection means. Get acquainted with Alice and Bob - characters known to every scientist, and study the principles of quantum encryption. Learn how a secret key is created based on the laws of quantum mechanics. A special model game will help reinforce the acquired knowledge. In it, participants will experience firsthand how to transmit important data and be confident that the information remains completely secret. Details can be found on the website.