No, quantum theory is not nonsense. Quantum theory, also known as quantum mechanics, is a fundamental framework in physics that describes the behavior of particles and energy at the quantum level. It provides a mathematical description of phenomena that occur on extremely small scales, such as the behavior of atoms, molecules, and subatomic particles.
Quantum theory has been extensively tested and verified through numerous experiments, and its predictions have been found to be in excellent agreement with observations. It has been successfully applied in various areas, including atomic physics, condensed matter physics, quantum optics, and quantum information science.
Quantum theory introduces several concepts that are counterintuitive from our everyday experiences, such as wave-particle duality, superposition, and entanglement. These concepts may seem strange, but they have been repeatedly confirmed by experiments and are essential for understanding and explaining the behavior of particles and systems at the quantum level.
While quantum theory may challenge our classical intuitions, it has been one of the most successful theories in the history of science and forms the foundation of modern physics. It has led to numerous technological advancements, including the development of lasers, transistors, and quantum computers.