(You are kindly requested to slow down this chapter and think about it. Of course, those who have learned wave functions and those who understand quantum theory can skip the knowledge points.)

Tang Qi searched his degree and background in his head and could confirm that his doctoral instructor was Ye Xuehai.

...I remember Professor Ye was also from mathematics. If he became a physics student in this world, would he be a consciousness traveler?

Wait, obviously this is impossible.

Even if Tang Qi does not admit that he is a physicist, his mastery of physics is not much inferior to mathematics.

Take the seven white frames for example. The appearance of that ball of white light involves quantum mechanics - wave function issues.

In quantum mechanics, the position and momentum of microscopic particles cannot be accurately measured, so its wave function can only be calculated using quantum equations.

There are more than a dozen interpretations of quantum theory for its insights into wave functions, but there are three mainstream interpretations: Copenhagen interpretation, multi-world interpretation and consistent historical interpretation.

In actual measurement experiments, the wave function is manifested as a superposition state, which encompasses the total number of all correct answers: that is, each measurement is the unique solution, but the results measured each time are different.

"Since there is only one right, why are there so many? And each of them is right?"

This is the question of the general public!

1. Copenhagen's interpretation is: measurement causes the wave function to collapse, but the collapse result is in accordance with its eigenstate.

The idea interpreted by Copenhagen only recognizes the wave function solved by quantum equations, emphasizes the real existence of the wave function, and does not express the measurement results. It means: the wave function represents all information, you should not measure it, once you measure, you can only get a result that conforms to its eigenstate, get a sesame seed and lose a watermelon!

Copenhagen's interpretation is a bit undecided and does not seek "empirical" colors, that is, it does not explain the origin of the world - the wave function represents everything. I told you that it has uncertainty and it is a probability event. As for how the world comes from, you can do it yourself.

Copenhagen's interpretation made everyone dissatisfied. After all, science emphasizes empiricality, so many world interpretations were born to make up for this defect.

2. "Every measurement result is correct and corresponds to a real world. The total number of correct answers corresponds to how many real worlds there are. As for which answer you choose, it depends on which real world you are."

This is the multi-world interpretation, that is, the parallel universe interpretation.

It recognizes that all the information represented by the wave function really exists, and it also conforms to "scientific" empirical evidence.

But the explanation has a paradox: "I" still has many "Is"? Isn't this nonsense? There is only one "I", right here!

Even if we admit that there are many "Is" real, one day when time travel is realized, can multiple "Is" come together to shake hands with each other?

What’s even more outrageous is that multiple “I” come together in the same time and space, and they all like the same girl, but in the end they can only have one. So tell me: “Did I marry her?”

3. Consistent historical interpretation: The result of collapse is not random, it conforms to historicity; before collapse, its parents and grandparents were here, so it is inevitable that collapse to this result.

The consistent historical interpretation conforms to the law of cause and effect, has a fatalistic color, and negates the positive side of things, which indirectly negates other information represented by the wave function.

It’s okay to not interpret consistent history, but once interpreted, it makes this theory even more pale: Since there is only one final result, why do you only calculate one probability result? This shows that your quantum equation is not accurate, or this theory is incomplete.

Regarding all interpretations of quantum theory, the mainstream accepts Copenhagen's interpretation. After all, he stands at the result of the solution of Schrödinger equation - it doesn't matter if the explanation is not correct, at least the position of the standing is absolutely correct. As for the correct explanation, let the future generations do it.

Later, "quantum decoherence" appeared as a remedy, which means that the wave function represents all information. Since this is an open system, quantum coherence will gradually lose over time due to quantum entanglement with the external environment, so it collapses.

But even this remedy still has loopholes: unless the speed of light can never be achieved, unless there is never a time machine, the grandfather paradox will appear - traveling through the past to kill the grandfather, will you disappear with it now, or will you not disappear?

If you disappear with it, you will deny your resignation relationship; if you do not disappear, you will deny your grandfather's resignation relationship.

It is precisely because quantum theory cannot withstand the question that scientists create themselves cannot even explain what they themselves have. This is one thing that makes scientists shame? No wonder the melon-eating audience joked like this: Don’t panic in everything, and when encountering unexplainable things, just throw them all over quantum mechanics.

As a basic science researcher, Tang Qi also favored Copenhagen interpretation and accepted the remedy of quantum decoherence - after all, as far as technology is concerned, light speed travel and time machines are very distant things.

As long as these two weapons have not been released, Copenhagen's interpretation will never be overthrown.

"However, before the quantum decoherence was released, the quantum decoherence was broken by my personal experience!"

Tang Qi's time travel is a time travel of consciousness, which cleverly breaks through the barriers to retreat:

...If I really travel to a parallel world, how can the body that is related to quantum regression be solved? After all, the body is "born and grown up" in the original world, rooted in the environment of the original world, and every atom that constitutes the body comes from the original world. Therefore, theoretically speaking, it is impossible for me to travel through time.

But now, a consciousness travels through time completely breaks through this barrier!

——The body belonging to the original world was abandoned directly and traveled into this world with consciousness.

"That is, as long as consciousness can be free from the body, it can completely break the constraints of quantum regression. So, what exactly is consciousness?"

Tang Qi felt like he had gone back again and returned to the starting point of his failed experiment.

Didn’t I just want to figure out what consciousness is?

"Consciousness can be separated from the body, so what form is it? Particles? Energy body? Waves?"

Go back to the starting point of the experiment—

"Why does consciousness travel? If consciousness travels without consciousness travel, can I still return to the original world?"

Tang Qi had thought about this question. He was thinking about the collapse of the wave function, which is reversible in time, irreversible. That is, after the collapse, it will recover in reverse, and can it still return to the wave function?

If it can be restored in reverse, it will definitely be able to return to the original world.

If not, you will definitely reach a parallel world.

"Can you really? You may find the answer to this question in the universe."

According to the principle of parity, parity is conserved in strong interactions and electromagnetic actions, while parity is not conserved in weak actions.

Conservation of parity, particles can perform spatial inversion.

The parity is not conserved, and particles cannot achieve left-right (mirror) symmetry in spatial inversion.

It is obvious that in that failed experiment, Tang Qi's consciousness did not return to the original body, but may have "decayed", which led to the occurrence of unconservation of parity and led to the formation of parallel space.

"Is this explanation correct?"

Tang Qi couldn't believe that this explanation was correct - the right words showed that he had really traveled through time, which was the result that he didn't want to accept from the bottom of his heart. He would even rather accept the fact that he was crazy.

"If it is finally confirmed that I have traveled through time, what should I do?"

"I can't go back, what can I do when I live here? A specious world, my life and work trajectory have changed. Can I still adapt to it?"

"Will it be a blessing in disguise, and based on this experience, I found the correct interpretation of the wave function and won a Nobel Prize?"

"No, this is definitely not a time travel of consciousness."

"Although quantum theory mentions consciousness, it is not dominated by consciousness, so it cannot be a time travel of consciousness."

"At least for now, there is no evidence that convinces me, proving that I have traveled through consciousness."

...

"Tang Qi, what are you in a daze?"

Liu Bang's words made Tang Qi come to his senses.

The three of them were walking on the stone steps down the mountain. Tang Qi asked Liu Bang about the origin of Master Zhichan, and only heard Liu Bang continue to say:

"You should know that there is a scientific research paper at the level of the mountain monster. You should know? The reason why the quantum communication I am engaged in today's achievements is entirely due to the publication of this paper. "Using cold atomic quantum storage technology to achieve entanglement exchange with storage and readout functions" was written by Master Zhichan before he became a monk. It was precisely because of this paper that I met Master Zhichan."

Chen Hong showed a surprised expression:

"Oh my God, because of this, our country has realized its first 'quantum repeater', clearing out a big stumbling block in quantum communication, and officially joining the international competitive stage of quantum communication. Unexpectedly, Master Zhichan, who has such great achievements, actually came to become a monk!?"

When Tang Qi heard the shocking background of Master Zhichan, he was a little stunned.

Although he had thought about it and expected that the Zhichan master had a good background, he didn't expect that he was so low-key - he turned out to be a leader!

...It seems that I should go to this Master Zhichan! This Master Zhichan is also from physics and has achieved such great achievements. Regarding my experience, he should be able to give me a definite result!

"I heard of quantum repeaters at that time. I haven't read that paper yet. Lao Liu, do you still have that paper in your hand? After you go back, pass it on to me."

Tang Qi expressed interest, but had another plan in his heart.

"No problem, I'll pass it to you after I go back."

Liu Bang agreed readily.

After the three of them went down the mountain, they stopped a taxi on the side of the road. Liu Bang and Chen Hong both took it in. Tang Qi, who had not gotten in the car, suddenly closed the door:

"You two left first. I hesitated for a long time, but decided to go back and find Master Zhichan. I have something very important to ask him for advice."

...

Four days later, something shocked the whole country came from the mountain city where Liu Bang and Chen Hong were: the city was locked down!

As neighboring cities, most residents of Shicheng were shocked when they heard the news.

"What happened? The mountain city has been locked down?"

"This is a city lockdown that only occurs when the war breaks out!"

"Didn't you read the news? A few days ago, a virus called 'e' infectious retina broke out in Shancheng. It was first transmitted through dust particles, but now it has developed into human transmission."

"Didn't that mean it's an ophthalmic disease? It's similar to red eye disease, it's not fatal at all!"

"At the beginning, I thought it was just an ophthalmic disease, so I was wondering what I had to do, but the situation I had seen in the news these days is a bit creepy."

"Are you dead?"

"That's not."

"Is it necessary to lock down the city?"

"The main reason is that the spread is too fast, and the 'e'character virus is a new type of virus, and its harm has not been fully grasped. In order not to spread this unknown crisis across the country, it is necessary to implement city lockdown control, and the virus is first enclosed in the mountain city."

Tang Qi quickly logged into the official news website of Shancheng.

Unexpectedly, the situation was so urgent and serious. More than one million people have been confirmed to be infected by the mountain city, which has a permanent population of nearly four million. It has only been five days since the first case was discovered, and one-quarter of the world of the mountain city has turned into a gray world.
To be continued...