The concept of superposition in quantum mechanics can be counterintuitive, and it often leads to confusion. In a quantum system, when it is in a state of superposition, it means that it can exist in multiple states simultaneously. However, it does not imply that all possibilities are simultaneously true.
Instead, in a superposition, the system exists in a combination or linear combination of different states, each with an associated probability amplitude. These probability amplitudes determine the likelihood of measuring the system in a particular state upon observation. The squared magnitudes of these probability amplitudes give the actual probabilities of observing each state.
Until a measurement or interaction occurs, the system's state remains in superposition, representing a range of possible outcomes. The act of measurement causes the system to "collapse" into one of the possible states with a probability given by the squared magnitude of the corresponding probability amplitude. This collapse is known as the process of decoherence.
Therefore, it is incorrect to say that all possibilities are simultaneously true in a superposition. Instead, the system is in an indeterminate state with probabilities assigned to different outcomes. The act of measurement resolves this uncertainty, and the system takes on a definite state.
It's important to note that the interpretation of quantum mechanics and the nature of superposition are still topics of ongoing debate and research in the field. Different interpretations, such as the Copenhagen interpretation, many-worlds interpretation, and others, offer different perspectives on how to understand the behavior of quantum systems.