In quantum mechanics, the concept of mass is not directly associated with a quantum state. Mass is a property of particles in classical physics and is typically described as a measure of the amount of matter in an object or the resistance it exhibits to changes in its motion.
Quantum states, on the other hand, describe the fundamental properties of particles and systems in the quantum realm. These states are represented by mathematical objects known as wavefunctions or state vectors, and they provide information about the probabilities of different outcomes when measurements are made on the system.
While mass is not intrinsically tied to quantum states, particles in quantum mechanics are associated with certain properties, such as rest mass and relativistic mass. Rest mass is an invariant property of particles, meaning it remains constant regardless of the particle's state or motion. Relativistic mass, on the other hand, is a concept that incorporates the effects of special relativity, where the mass of a particle can appear to change depending on its velocity.
In summary, the mass of a quantum state itself is not a well-defined concept. Mass is a property of particles described by classical physics, while quantum states describe the probabilities and properties of particles within the framework of quantum mechanics.