In quantum mechanics, measurement refers to the act of observing a quantum system and obtaining information about its state. This can involve performing physical experiments or observations, and the results of the measurement are often described in terms of probabilities.
Quantum mechanics explains the correlation between particles through the principle of entanglement. This means that two or more particles can become entangled, meaning that their states are dependent on each other. This correlation can be observed even when the particles are separated by large distances, and it is a fundamental aspect of quantum mechanics.
The Heisenberg uncertainty principle states that it is impossible to know both the position and momentum of a particle with absolute certainty. This means that the more accurately we know one of these properties, the less accurately we can know the other. This is a fundamental principle in quantum mechanics and has important implications for measurements and observations.
In classical mechanics, measurement is seen as a passive process, where the system being observed is not affected by the act of measurement. In quantum mechanics, however, the act of measurement can change the state of the system being observed. This is because the act of measurement involves interacting with the system, and this interaction can alter its state.
No, according to quantum mechanics, the outcome of a measurement can only be described in terms of probabilities. This means that it is impossible to predict the exact outcome of a measurement, but we can calculate the likelihood of different outcomes based on the state of the system and the properties being measured. This is one of the key differences between classical and quantum mechanics.