It was like a dream, and Lu Chen wondered if he had seen a ghost.

He walked around the small world and walked the same way he came in.

When he reached the end of the forest road and heard the sound of the mountain spring, he subconsciously looked back, as if hoping someone would stop him.

But he turned around and saw that the river beach where he had had a barbecue with the old man was empty, only sand and pebbles all over the ground.

Lu Chen's mind was in chaos at this time. He remembered what the old man had said to him a few days ago and discussed the cause and effect.

Because Lu Chen cultivated the Karma Sword Intent, but his Karma Sword Intent was learned from a certain future version of Plas Lu Chen and evolved to this point.

He entered Taoism through martial arts and touched on cause and effect. In fact, he still has not fully understood the nature of cause and effect. He still has a long way to go in the realm of sword intention.

But as an immortal king-level being who could traverse the long river of time, the old man certainly had a much better understanding of cause and effect than Lu Chen, so he gave some pointers.

He said that masters at a certain level will have different views on cause and effect. Some people are very afraid and do not want to be easily contaminated by any cause and effect. As a result, they sit in a state of death all year round and almost never appear in the world.

There are also some people who believe that my destiny is determined by nature, and they are unscrupulous and firmly believe that no cause and effect can liquidate themselves. As long as they are strong enough, they will not be afraid of any other cause and effect.

The commoner old man said that in fact, each of these ideas has its own truth, and sometimes it is necessary to think about the essence of cause and effect.

Cause and effect are always related things, but all related things are generally balanced. If one side changes, the other side will also change.

So there is no beginning, no cause and effect. If there is an effect, there is a cause, and if there is a cause, there is an effect.

In other words, the effect in the future will also affect the cause in the present. The effect can come first and then the cause.

The essence of the Great Path of Cause and Effect lies in this, and the endless transformations that have occurred since then are the extension of this Path.

Some people say that the end of science is theology, but Lu Chen also remembered what Chu Zihang said to him. After theology is understood, it becomes science.

In fact, no matter what kind of scientific theology there is in the world, they are all basically basic truths. As long as you understand them clearly, they are not something that is awe-inspiring or a headache.

When Lu Chen and Chu Zihang entered the hometown of God Burial Calendar, they discussed the issue of cause and effect. In order to help himself understand some things, Chu Zihang also cited some experiments done by mortals in the past.

Although it is simple, it also reflects some truth.

Chu Zihang told him that there was once a scientist in their hometown who conducted a double-slit interference experiment in order to prove that light is a wave, because interference is a unique property of waves.

Chu Zihang told Lu Chen that this was a well-known experiment. Lu Chen still asked Chu Zihang to explain it in detail without blushing. I am illiterate. Who should I be afraid of?

Chu Zihang briefly explained the science to Lu Chen. In fact, it is to place a baffle with a small hole in front of an ordinary monochromatic light source as a monochromatic point light source, and place another baffle with two holes in the lighting range of the small hole.

After the light passes through the baffle with a small hole, it will act as two secondary wave sources and emit secondary waves forward, that is, spherical waves, forming an overlapping wave field.

At this time, place a receiving screen far away, and a set of almost parallel straight lines can be observed on the screen.

This experiment showed that light has the nature of a wave. It was once thought that light was a wave. It was not until later generations that other physicists completed the work and discovered that light has wave-particle duality because they confirmed the nature of light particles.

exist.

There was nothing wrong with coming here. Physicists who were keen on seeking knowledge and searching for the truth, including many elders of Kassel College, carried out a series of experiments in order to further understand the truth of the world.

As a result, an amazing thing was finally discovered, that is, when only one light particle is released at a time, interference will still occur, and multiple bright and alternating stripes will appear.

Lu Chen was confused when he heard this, because although he was illiterate, he was not stupid. If he had the patience to learn knowledge, he would certainly be able to understand it.

At that time, Lu Chen only had a Great Sage level cultivation and was more focused on martial arts. He had not delved into the nature of all things in the universe, so he had not carefully studied the light in various worlds. He only knew that the physical rules of different universes were different, but

The conversion principle is generally in line with some common sense of modern physics.

According to what Chu Zihang said before, light has wave-particle duality. Only when a large number of photons are released at the same time, because the speed of light is very fast and the distance is short, will they interfere with each other. But there is only one light particle.

How does it interfere?

Could it be that it interferes with itself? As a light particle, can it pass through two slits at the same time?

Then Chu Zihang popularized the superposition state with himself, and once again used the Schrödinger's cat that he had heard of as an example. The cat is in a dead or alive superposition state. Only measurement, that is, observation can make this superposition state

collapse.

Here, the photon is in a superposition state of passing through both slit 1 and slit 2. As long as you do not measure at the slit, you cannot determine which slit the photon arriving at the screen came from.

.

When he heard this, Lu Chen immediately captured a photon for research. For his cultivation at that time, this was just a trivial matter in the dragon universe, but it was not that easy in his home world.

Because in the super large world universe, he and Chu Zihang had long discovered that the propagation speed of light was different from their previous common sense and was much faster. This also explained why there were people fighting in the depths of the universe, and many people could

See the reason.

Lu Chen wanted to dismantle the photon, but unexpectedly found that he couldn't do it. This shocked him at the time.

It's not that he is arrogant, but since he became stronger and stepped on technology, he felt that the extraordinary side was the strongest. I can manipulate some elements of nature, isn't it easy for me?

Moreover, some of the secret techniques among monks can indeed turn stone into gold and change the essence of elements. Lu Chen can also do this, but after reaching the smallest point, he found that he couldn't see through it.

He couldn't understand things that ordinary people couldn't understand, which puzzled Lu Chen.

He had no choice but to be patient and listen to Chu Zihang's explanation, and how the great men in the physics world in the past studied it.

When Chu Zihang mentioned this, he also looked weird. He said that physicists use a light source to only emit one photon at a time and open both slits, but place a photodetector at the slit, which means that each photon can be observed.

Which slit to go through.

When Lu Chen heard this, he felt a little funny. He thought to himself, physicists are really good at doing tricks. What, do you think it's different?

And due to technology limitations, the photodetectors at that time were actually unable to capture it clearly.

But the answer Chu Zihang told him next made Lu Chen feel a little weird, because the result was that the interference pattern disappeared and just turned into two simple beams!

In other words, when there is an observer, photons will not interfere with themselves, just like the rules set by God, prohibiting mortals from prying into the truth of the world.

"You're quite naughty, but you can't show off your true skills just by staring at me?"

Lu Chen commented at the time that he was a big-hearted person and did not feel anything creepy. He firmly believed that as his realm improved, one day he would be able to understand cause and effect, let alone simple natural phenomena?

However, the follow-up experiment that Chu Zihang mentioned next made Lu Chen understand why Chu Zihang told him this story.

Physicists were unwilling to give in and had to find out the truth of the matter. They performed various tricks to compete with photons. For example, the photoelectric detector was sometimes turned on and sometimes turned off, which was called "sneak attack".

But the photon is not fooled at all. As long as it is observed, it will not interfere with itself.

How could a group of lunatics from the Equipment Department of Kassel College be willing to do so? The old academics still wanted to figure out what was going on.

They speculated that some circuit operations in the photoelectric detector may have affected the self-interference of photons, so they found a Transcendent A-level secret party member to assist in the experiment. His speaking spirit is a snake, which is a powerful information collection device.

The spirit of ability.

Due to his high bloodline, his ability is almost psychic. When using the word spirit deeply, he can almost see the trajectory of light, so he was asked to assist in the experiment.

This time, instead of observing by machines, observations were made by humans. The experiment started again, but the results made the physicists at Kassel College almost crazy.

Because when Photon was being stared at by the secret party master, he still didn't interfere and just let it go.

Although they knew that dragons existed in the world, they all believed in science. It is said that some people committed suicide by swallowing a gun because their faith collapsed.

The experiment did not stop there, some great scientists came up with new things.

What kind of quantum erasure experiment, what kind of blink experiment, what kind of quantum erasure experiment with delayed selection, but it took a long time and failed to succeed. It can be said that it was a battle of wits and courage for more than ten years.

Due to technical limitations, single-photon light sources can be realized with local defects at the atomic scale. As for the definition of a single photon, rather than emitting only one photon at the same time, it is better to say that only one photon is emitted within the limit of the photodetector.

.

That is, the stuck time difference completes the so-called single photon.

Finally, the physicists performed the ultimate trick, allowing the photon to pass through a double slit and be split into two, converted into two entangled down-frequency photons A and B.

Let A move toward the screen and B run toward the detector. Since they were entangled before, the state of A can be deduced by observing the state of B.

But this experiment didn't work, so they continued to split B, down-frequency it again and split it into B1 and B2, and let them enter a maze. The maze was made of special superconducting materials and had a complex internal structure. Even the speed of light was very fast.

It takes a long time to reach the end.

They placed detection instruments on some maze paths. B1 and B2 ran randomly in the maze, and the probability of passing different detectors was also different.

Old physicists think you can't run away now, right? I'm plotting against you from two levels away.

But as a result, A photons still do not interfere.

Lu Chen didn't understand the significance of this experiment at first. After Chu Zihang explained it, he finally understood it.

Since the maze is very large, photon A is very close to the baffle and will definitely arrive on the board first. In other words, it has already arrived before B1 or B2 is captured and deduced by the detector.

There is a time difference in between!

Because people did not observe A photons, but only observed the "future" B photon descendants, but this still did not interfere.

Kassel College has abundant funds to expand this experiment. The maze is made of high-end materials. It is said that the time for light to pass through should be five minutes.

But A still doesn't interfere, which is a bit mysterious. It's like the descendants of photon B say in the future that I have arrived and told photon A that someone is observing it and you should not mess with it.

And if the photon of B's ​​descendant passes through the maze without being captured by the detector, then A will interfere, just like the descendant of B's ​​photon arrives and says, I'm here, no one has discovered the secret, you can mess around.

This subverts the most basic principle of cause and effect, and the effect comes first, then the cause.

After Lu Chen listened, he pondered for a long time and looked at the small photon he had captured. He immediately conducted an experiment with Chu Zihang. The results were the same. As long as they looked at it, there would be no interference.

If you find a mortal child to come and take a look, the child will discover the phenomenon of interference.

Later, Lu Chen was injured by Plas Lu Chen. He realized the Tao through the Karma Sword Intent, and finally mastered the Karma Sword Intent initially. When he went to Zhetian World, he also studied the basic form of the universe because of his higher cultivation level.

By the time of the Red Dust Immortal, he had already been able to penetrate the world, and it was not a problem to even destroy that large universe. However, by observing some basic phenomena, he could only capture half of the mystery.
To be continued...