No, quantum mechanics is not the worst possible physics ever invented. In fact, quantum mechanics is one of the most successful and well-established theories in physics. It has been rigorously tested and validated through numerous experiments and observations, and it accurately describes the behavior of particles at the microscopic scale.
Quantum mechanics has been incredibly successful in explaining phenomena that classical physics could not account for, such as wave-particle duality, the quantization of energy levels, and quantum entanglement. It provides a framework for understanding the behavior of atoms, molecules, and subatomic particles. Additionally, many technological advancements, such as lasers, transistors, and atomic clocks, rely on our understanding of quantum mechanics.
However, it is important to note that quantum mechanics does introduce some counterintuitive concepts and challenges our classical intuitions. For example, the superposition principle, where particles can exist in multiple states simultaneously, and the uncertainty principle, which sets limits on the precision of certain measurements, can be difficult to grasp from a classical perspective.
Regarding the complexity class NP (nondeterministic polynomial time), it is a concept from computer science and computational complexity theory, which deals with the efficiency of algorithms. Quantum mechanics, as a physical theory, is not directly related to computational complexity classes.
Quantum computers, which leverage the principles of quantum mechanics, have the potential to solve certain problems more efficiently than classical computers. They can exploit quantum parallelism and quantum interference to perform computations in parallel and potentially speed up certain calculations. However, it is important to note that quantum computers are not a panacea and are not expected to solve all problems faster than classical computers. The extent of their computational advantage is still an area of active research and depends on the specific problem and algorithm being considered.
In summary, quantum mechanics is a highly successful and accurate theory in physics, and quantum computers have the potential to provide computational advantages for certain problems. However, it is not accurate to describe quantum mechanics as the "worst possible physics" or directly link it to the complexity class NP.