👉 In quantum mechanics, an "untimesome" is a state or observable that behaves as if it were not present at all. This can be seen in situations where the observer is experiencing a time-reversal symmetry or a non-locality property. For example, consider the state of a single particle in a quantum system, such as a quantum dot or a quantum circuit. If we measure the state after a delay, we would observe that it has changed significantly. This change in state cannot be
