Technological power starts with upgrading lenses

In the fiber-optic cable field of quantum encryption technology, China has achieved 100 kilometers of direct quantum distribution, which is of practical value. The current main focus is on quantum repeaters, which are used to relay and extend communication distances.

In the wireless field, many attempts have also been made.

In 2022, China Aerospace successfully launched the world's first quantum science experimental satellite 'Mozi', and through the Mozi satellite, it launched entangled quantum particles to the Deharing and Dayan observatories on the ground. , conducted a quantum state remote transmission experiment 1,200 kilometers from the ground.

The hosts of these two experiments are Pan Jianwei's team from the Luzhou Micromaterial Research Center.

In terms of satellite wireless communications, they used a 'quantum teleportation' solution based on a two-photon path-polarization mixed entangled state, which solved the problem of photons being affected by atmospheric turbulence during the propagation of photons in the atmospheric channel, and successfully conducted experiments on six typical quantum states. Verification, improving the transmission fidelity of entangled quanta.

But because the quantum carrier is still a radio wave after all, it is very susceptible to environmental interference.

Coupled with the phenomenon of quantum observation collapse, quantum is very 'fragile'. Even if a stealth solution is used, the fidelity of this wireless key distribution is still far from practical application.

This time, Kangchi directly increased the test distance to more than 4,000 kilometers.

If this experiment can be successful, extending the distance to Mars and the Earth should not be a problem at all.

After all, this is quantum communication in the true sense. It is based on the entangled relationship between two quanta at a higher latitude. During the transmission of information, there is no need to rely on any carrier in the real world, let alone real-life factors. interference.

If you want to interfere with quantum communication, you have to interfere with high-dimensional space.

But even Kang Chi, who can cheat, can't achieve this kind of ability!

At least, it certainly can't be done now.

Unless there is even a little bit of theoretical basis in the future.

…

Although Cai Yaobin does not understand the specific technical details, from the distance of this experiment, you can roughly guess how important it is.

It should be similar to launching a quantum experiment satellite, right?

In addition, Kang Chi had to personally preside over the experiment, so Cai Yaobin did not dare to be careless at all. He directly called the leaders of the southern and northern theaters and explained the situation to them, hoping that they could cooperate with the experiment.

In fact, the two leaders had just met Kang Chi two days ago at XAC. After returning, their dreams were all about the spectacular scene of the Y-20S prototype taking off on the field runway. Therefore, after hearing that it was his experiment, they immediately paid great attention to it. .

Two hours later, a Y-20 and two J-20s landed at Pangu Airport first.

At this moment, Kang Chi was still packing experimental equipment with Yan Hui and others.

More than an hour later, after they packed the equipment and held a meeting with Yan Hui and others to explain how to use the equipment and the specific procedures of the experiment, the aircraft from the northern theater finally arrived.

They were far away, so it took a while, but two fighter jets and a transport plane arrived.

Mainly, they didn't know whether Kang Chi was going to Sansha or Mohe, so they simply arranged for escort fighters...

When Kang Chi led people to drive the equipment out of Pangu Base, he couldn't help but be slightly startled when he saw a row of military aircraft parked at the airport.

As for Yan Hui, he looked even more confused. After a while, he said with a guilty conscience: "This posture... Why does it feel like you are taking us to fight?"

"You're overthinking. There's no need for our strength in a war. They're just escorts, do you understand?" Kang Chi was very satisfied with this. "Sure enough, Mr. Cai is more reliable and feels safe!"

Chen Hai: "..."

Why do you feel like you have become more and more like a dispensable mascot recently?

…

Among the two test locations, Kangchi chose Sansha without hesitation.

The main reason is that it is still a bit cold in Mohe in April. If you go there to get cold, how can you go to Sansha to see the sea and cultivate your sentiments?

So the glorious and arduous task of Mohe was handed over to Yan Hui.

Ten minutes later, six planes began to take off one after another.

After a two-hour flight, the plane successfully landed at Yongxing Airport.

As soon as he got off the plane, Kang Chi felt a wave of heat, and the air was filled with a salty smell of the sea.

When Shu Jinchuan, a garrison officer in Yongxing, saw Kang Chi bringing people down, he immediately saluted with a military salute: "Dr. Kang, welcome to Sansha!"

After saluting, he shook hands with Kang Chi and said with a smile: "I am Major Shu. If Dr. Kang needs help, just tell me."

"Well...this experiment is actually very simple. You just need to find a room for us to put the equipment."

"receive!"

So Kang Chi's three experimental assistants, with the help of five soldiers, quickly moved the experimental equipment on the transport plane onto the pickup truck, and then moved it to an empty warehouse with the convoy.

While the assistant was installing and debugging the equipment, Kang Chi received another call from Cai Yaobin.

"Have you arrived in Sansha?"

"Well, I just arrived not long ago."

"Can you wait for us? We won't arrive for another hour!"

"us?"

"Mr. Ren heard that there is progress on your side and wants to come and take a look."

"Oh, I understand. It's okay. You don't have to worry. Yan Hui probably hasn't arrived yet."

"Ah That's good!"

After hanging up the phone, the experimental equipment was almost debugged. Kang Chi checked it carefully again. After confirming that there was no problem, he asked Major Shu to take them around the neighborhood.

Although Sansha is a city, the area of ​​the main island is actually very small. Most of it was reclaimed and expanded. You can see the beach and sea within a few steps.

I have to say that the sky and sea here are really blue, just like adding a layer of filters, which makes people feel relaxed and energetic at the first sight.

However, the sun is really poisonous. Kang Chi felt his skin was a little burning after being exposed to the sun for less than ten minutes, so he hurried back to the temporary laboratory. As soon as he stepped in, he heard the sound of an airplane engine in the sky.

Sure enough, it didn't take long for Cai Yaobin and Ren Zhou to enter the temporary laboratory under the leadership of several soldiers. After the two parties briefly greeted each other, Ren Zhou couldn't help but ask Kang Chi: "Have you really found the hidden variable?" ?”

Kang Chi nodded, then shook his head: "I just confirmed that this hidden variable exists, but how it affects the quantum entanglement state is still unknown."

Kang Chi briefly explained his previous high-dimensional conjecture using the example of the island and the sea.

"The quantum capture device of this experimental device has two additional element decay devices. They are like the two hands of a fisherman. When the fisherman saw a fin exposed on the undulating sea surface, he immediately paid attention to the fish. The two sides of the fins flap, and the mass is converted into energy, so the water level drops again, and a complete fish appears, and what we have to do next is to go over in a net and really catch the fish."

Cai Yaobin suddenly wondered: "Then why did the fisherman just catch the fish without using a net bag?"

"Mr. Kang just gave a more vivid and easy-to-understand example."

Ren Zhou immediately helped Kang Chi and explained to this layman who was even more layman than him,

"We simply cannot understand the rules of higher dimensions. Although the two worlds may be in harmony with each other and can even use energy to affect the junction point, in the final analysis, both sides are in worlds with completely different rules."

"If we take Mr. Kang's example as an example, then the fisherman's net bag is a material that melts when exposed to water, just like we cannot enter high-dimensional space."

After Ren Zhou finished speaking, he turned to look at Kang Chi: "I wonder if my understanding is correct?"

Kang Chi nodded: "That's almost the truth."

Cai Yaobin suddenly realized: "I understand this explanation, but how to do it, at the moment when the entangled quantum is launched, emit two photons at the same time? And just pass by the entangled quantum without bias, At the same time, force out the true entangled quanta?"

In fact, Ren Zhou also thought about this problem just now.

But I feel like I can’t think about it at all…

Because it's too scary.

Even though Kangchi's equipment looks ordinary here, it is definitely an ultra-precision instrument that is more difficult to build than a photolithography machine.

In a sense, the entire equipment is a micro-particle collider.

However, it does not allow particles to collide directly, but uses the strong force between multiple waves to cause dimensional oscillations around the quantum, thereby producing some kind of new quantum.

It has to hit, but it can't really hit, and the whole device is so small...

The difficulty of manufacturing this kind of multi-particle device that accurately stirs dimensions makes Ren Zhou feel his scalp numb just thinking about it!

He couldn't imagine how Kang Chi was created...

He probably wouldn't understand even if Kang Chi told him, so he simply didn't even ask.

So Kang Chi and Ren Zhou tacitly ignored Cai Yaobin and skipped this topic...