The world is full of wonders and possibilities. For example, ghosts, Westerners call ghosts, Chinese called ghosts. So, are ghosts real? Since the discovery of quantum mechanics, the existence of ghosts seems to have become a non-superstitious category, and science can justify their existence.
According to Schrödinger's cat in quantum mechanics, suppose a cat is kept in an airtight container containing a small amount of radium and cyanide. There is a chance of radium decaying, if radium decays, it will trigger the mechanism to break the bottle containing cyanide, and the cat will die; If radium does not decay, the cat survives. According to the theory of quantum mechanics, since radioactive radium is in a superposition of decay and no decay, cats should be in a superposition state of dead cats and live cats. This dead and alive cat is the so-called "Schrödinger cat".
If a ghost is a person who exists in a quantum state, after death, the person is in a superposition state of death and non-death. In this cloud of quantum probability, people see that the person is more likely to die, so the person is dead. And when people don't look at the "dead man", it returns to the probability cloud state, and the relatively small probability that the "dead man" is not dead still exists, but the probability of being observed is very small.
So, who can see the small probability that the "dead person" is not dead? This brings us to the question of whether the quantum state collapses.
So, under what circumstances does a quantum state not collapse? For example, people suddenly, inadvertently, delusionally, confused and other states see that the "dead person" is not dead.
This can explain why people return to the light before death. Many of the author's relatives said before they died of old age that they saw "people" around, but their family members said they did not see anyone and blamed them for their nonsense. This is when the person is in a weak observation state, the quantum state does not collapse, and the ghost in the quantum state will be seen as an entity.
I don't know if this explanation is right? There are no wonders in this world, sometimes it is better to believe in it, not to believe it, and there are gods on the head. Usually do more good deeds, do not do bad things, a person's strong consciousness state will be stronger, not afraid of having the worry of being afraid of ghosts knocking on the door in the middle of the night after doing bad things!