【General understanding of decoherence】
The universe you live in is made up of space-time and quantum.
Quantum has the characteristic of behaving like multiple "waves", and the ease of interference between "waves" is called coherence.
A state in which there is no phase disturbance between "waves" is called a coherent state.
The contraction of quanta as "waves" in the coherent state due to interaction with the environment is called decoherence, and this state is called the decoherent state.
This "interaction with the environment" is called "observation".
Originally, the quanta that make up the world are in a coherent state, and the decoherence that breaks this coherent state is caused by "observation".
The "observer" can be a person, a device, or a quantum.
This is because decoherence means the occurrence of "new quantum entanglement".
"Quantum entanglement" is a property of quantum in which, as soon as the state of any quantum A is determined, the state of quantum B, which has a strong correlation with this quantum, is also identified.
Due to the occurrence of "new quantum entanglement", the quantum information that the quantum had until then is lost, so it shifts to a decoherent state.
By the way, in order to stop decoherence, it is necessary to reduce the number of quanta to be observed as much as possible, or to lower the environmental temperature to absolute zero to stop the movement of quanta.
The above is a general explanation of "decoherence".
This is a proven fact...
Don't you feel like there's an important piece missing from this description?
【Quantum properties at work in you】
By the way, in the photosynthesis performed by plants, quantum characteristics are used as a means of identifying the path with the least loss when transferring the electrical energy obtained from "photons" in the chloroplast to the centrosome.
The same thing has been confirmed in the mechanisms of many living organisms, including the respiratory chain of animals and the compass function of birds.
Yes, your brain's activity is also underpinned by quantum properties.
In other words, quantum properties are essential systems for the survival of life.
If quantum properties can only occur in a tightly controlled box at absolute zero, how do you explain the quantum workings that are still happening in your body?
Something seems wrong.
【The identity of decoherence in you】
As I mentioned last time, in this blog, "waves" represent the "superposition state" of an infinite number of universes.
In other words, coherent state.
Also, the contraction of the "wave" is the determination of one universe in which the observer exists, among various patterns of the universe.
In other words, decoherent state.
And "quantum entanglement" was a quantum property that the state of quantum B was instantly determined when the state of quantum A was determined.
Think about it.
A coherent state is a state of superposition of countless universes with infinite patterns.
Decoherence is the process of seeing only one of the myriad patterns.
The fact that the state of the quantum AB that appeared in ``quantum entanglement'' is ``determined'' means that only one of the infinite patterns can already be seen, that is, it is decoherence.
In other words, the process of observing "quantum entanglement" is already decoherence, and "quantum entanglement" itself does not cause decoherence!
Even if "new quantum entanglement" occurs, until it is "observed", the coherent state of the universe and "superposition" of the pattern in which "new quantum entanglement" does not occur is maintained. No quantum information will be lost.
Therefore, the cause of decoherence is not the occurrence of "new quantum entanglement" but the "observation" itself.
Then the story goes back to normal.
What is "observation" again?
Observation requires an “observed object” and an “observing subject”.
This is a relative relationship.
If quantum A or B becomes "object" or "subject", decoherence occurs between this AB, but the outside of it, which is not an object-subject relationship, remains in a coherent state.
Next, when the quantum AB is the "object" and the thing outside this becomes the "subject", decoherence occurs between the quantum AB and the thing outside, but the outside remains in a coherent state. .
Next, if the quantum AB and what is outside are set as "object", and what is outside it becomes "subject", it goes on and on.
Certainly, the subject of the act of "observation" may be a quantum or a device.
However, in order for the act of "observation" to have meaning, it is necessary for the observer to understand the results of the observation.
If quanta or machines were the subject of observations, we could store the results of observations, but that is different from understanding.
For example, even if quantum or equipment observes, it is only "consciousness" that sees (understands) the observation results.
The subject that can make meaningful "observations" is, after all, "consciousness."
In other words, the cause of decoherence is the "consciousness" within you.
However, "consciousness" does not create some kind of world.
Originally, the world is a "superimposed state".
The "consciousness" of life, which is the physical phenomenon inside it, is made so that it can only see one universe in terms of its function.
This is the point of view when such "limited consciousness" tries to see the "superimposed state" of the universe.
That is the essence of decoherence.