From Almighty Scholar to Chief Scientist

Chapter 487 Five-Freedom Quantum Teleportation?
Although Lin Xiao felt that he had been tricked, there was no other way, and now was not the time to refuse.

In other words, he generally would not refuse this kind of technology that he actually has an interest and purpose in researching.

Of course, fortunately, after some understanding, he learned that Yueshi Division and the space agency have invested in research on these two technologies and obtained a lot of results.

For example, there have been certain breakthroughs in the dual-mode switching technology of aerospace engines.

The most important point of an aerospace engine is to be able to seamlessly switch between an aeroengine and an aerospace engine. Only in this way can an aircraft not only have the ability to fly in the atmosphere, but also have the ability to navigate in outer space. ability.

But the problem is that their current engine switching system is not perfect. The main problem is that the switching speed is relatively slow, especially the time it takes to switch from an aeroengine to an aerospace engine. The timing of the engine is not that important.

Because when switching from an aerospace engine to an aeroengine, it must be the time to land from the universe to the earth, and at this time, relying on the aerodynamic design of the aerospace plane itself, it is completely possible to use the air buoyancy to carry out the landing first. Glide, and then complete the switch while gliding.

When switching from an aero engine to an aerospace engine, it is basically in a state of liftoff. At this time, the aerospace plane is about to break through from the atmosphere to outer space, and when the engine is switched, the aerospace plane is tantamount to completely losing space. power.

At this time, once the switching time is too long, the ascent speed of the aerospace plane will decrease due to gravity, and it may even stall completely, and finally the aerospace plane will start to fall down.

At this time, they are very likely to completely lose control of the aerospace plane, which will lead to accidents.

So in order to avoid this result, this system still needs to be improved, so as to reduce the time required for switching.

As for another quantum communication technology, in fact, a long time ago, under the leadership of Academician Pang Wei, they have realized long-distance communication from the earth's surface to artificial satellites, but obviously, this technology is not stable yet, and at the same time, it cannot Achieve communication over longer distances.

As for Yue Shisi and the others, it is very clear that what they want to achieve is the quantum communication between the earth and the moon.

However, what Lin Xiao knows better than them is that they want to realize the quantum communication between the earth and Mars.

Obviously, the distance between these is a leap-like improvement.

In 2022, they will achieve 100 kilometers of direct quantum communication, which is the longest quantum information communication in the world.

However, the shortest distance between the earth and the moon is 36.3 kilometers, not to mention the distance between the earth and fire. The farthest distance between the earth and Mars is as high as 5500 million kilometers, and even the shortest distance is [-] million kilometers.

Obviously, the communication distance they can achieve now is not enough.

As for why quantum communication is realized, it is for the non-delay nature of quantum communication.

There is a delay of more than a second for even a beam of light from the earth to the moon, not to mention the radio communication they use.

Their Yutu-[-] lunar rover performs missions on the back of the moon, and because the back of the moon always faces away from the earth, it is impossible for the radio waves sent directly by Yutu-[-] to be received by the earth. .

Because it is obviously impossible for radio waves to pass through the moon and then be received by the surface of the earth.

Therefore, the Queqiao lunar artificial satellite is needed to act as a relay station in the middle, so after several links in the middle, if the earth wants to receive it, the fastest will take more than 12 seconds.

But quantum communication is different. Unlike radio waves, its transmission needs electromagnetic waves as a carrier, so there is no need to worry that the moon will block the signal, and the use of the no-delay nature of quantum entanglement can also allow them to communicate almost instantaneously. Get the information, let the connection between the celestial body and the celestial body be realized without delay.

And this is obviously of great help when they perform outer space operations.

Especially what they are facing now.

First of all, what Lin Xiao knows very well is that once they go to Mars, if any danger occurs, the instantaneous communication advantage of quantum communication will allow them to respond immediately when the danger comes.

After all, once you go to Mars, no one knows the dangers, and once quantum communication is established, you will be able to eliminate a lot of this sense of crisis, especially for those who will go to Mars in the future. For astronauts, it can be regarded as a kind of psychological comfort. After all, they can keep in touch with their hometown all the time.

"The question, then, is what technology to look at first."

In the Dingguang Research Institute, Lin Xiao thought about this problem.

And soon, he made a decision.

That is quantum communication technology.

Because compared to aerospace aircraft that have never been successfully achieved, quantum communication, which has already had successful cases, is relatively easier to study.

At least that's what he thinks now.

As for the aerospace plane, the problem to be solved is most likely to be some kind of material problem, and now he can feel helpless when he hears about the material problem.

Who made almost half of all the problems facing the world be material problems?

So let's solve this quantum communication problem first.

As for how to solve the quantum communication problem, Lin Xiao quickly thought of a good assistant, Pang Wei.

Although Pang Wei doesn't seem to know anything about Yueshi Division, if it is to study quantum communication technology, it is obviously possible to study it whether he joins Yueshi Division or not.

Of course, Lin Xiao didn't forget to ask Yueshi Division if he planned to let Pang Wei know about the Yuebei, but Yueshi Division rejected the proposal. The reason is that if it is not necessary, try not to let too many people know Yueshi Division.

Lin Xiao wasn't surprised to get this reply, so he didn't ask any more questions. He could only feel sorry for Pang Wei, not being able to get in touch with this news that would open the eyes of all scientists.

Of course, maybe this news will be known to everyone in the future, maybe?

However, what will happen in the future is not something he needs to consider. Next, he just needs to find Pang Wei and invite him to study quantum communication technology together.

So later, he called Pang Wei, and when Pang Wei learned that he was going to study quantum communication technology, he naturally didn't say much, and agreed immediately. Who told him to study this background.

Since Pang Wei's Quantum Physics and Quantum Information Research Department has relatively good quantum information research facilities and research environment, they decided to conduct research here, and Lin Xiao will also go there in the near future.

After discussing various things, Lin Xiao hung up the phone, and then began to make preparations for Feishi.

……

A few days passed, Quantum Physics and Quantum Information Research Department.

"Chief Lin, you're here, I'm sorry to welcome you."

After seeing Lin Xiao who got off the car, Pang Wei greeted him with a smile.

And Lin Xiao also said with a smile: "Academician Pang, academician Pang, you were asked to help me research quantum computers before, and now it's time for you to help me do research."

Pang Wei laughed loudly and said: "Of course it's no problem. My seven-foot body will be left to you, Chief Lin, and I will do whatever you ask me to do. It's just right, since the creation of Qiankun No. [-] After that, I was basically free, which can be regarded as a vacation for myself.”

Lin Xiao was speechless immediately.

Good guy, you are on vacation when you are on vacation, and then you advertised my affairs by the way?
If it weren't for Pang Wei, academician Tan Jinri of the space agency might not have found him so soon.

In the end, he could only pat Pang Wei on the shoulder and said: "Okay, Academician Pang, this is what you said, I remember, your seven-foot body-oh, strictly speaking, it should be your mind, I want to put it to good use."

"Of course no problem." Pang Wei nodded and said with a smile, "Of course, don't borrow someone's head like Cao Cao."

"Don't say it so scary." Lin Xiao waved his hand.

Pang Wei laughed a few times, and without further words, he led Lin Xiao into their quantum physics and quantum information research department.

Of course, Lin Xiao has been here many times. After all, Qiankun No. [-] is here, so he is familiar with the road here.

In this way, they arrived at the Quantum Communication Laboratory with three turns and two turns.

"This laboratory can communicate with our quantum communication nodes all over the country, and now it has basically covered [-]% of the provincial capital cities in the country."

After entering the laboratory, Pang Wei briefly introduced the status of the laboratory to Lin Xiao.

"Excellent." Lin Xiao nodded and praised.

These quantum nodes mainly communicate with the Micius quantum satellite in the sky, and then Micius transmits information to other quantum nodes.

Of course, the main use here is the confidentiality of information in quantum communication, not the delay, because in terms of delay, sending a message directly from Weixin is faster than this method.

Because although quantum entanglement is completed instantaneously, the decoding process is not instantaneous, so the final speed is not as fast as the network speed on the earth.

"Okay."

Hearing Lin Xiao's praise, Pang Wei just smiled, and then said: "Quantum communication at this distance is nothing. If you want to realize quantum communication between the moon and the earth, the difficulty will be a leap forward." gone."

Then he asked curiously: "But having said that, Chief Lin, why did you suddenly decide to study this thing?"

Lin Xiao said resentfully, "This is all thanks to you, Academician Pang."

Then he told Pang Wei the reason.

Pang Wei was taken aback, "Academician Tan Jinri of the Space Administration listened to me..."

Halfway through the speech, he burst out laughing, "How wonderful this is, Chief Lin, you are well-known now."

Lin Xiao rolled his eyes, "Now it's quantum communication technology, and I don't dare to think about what I will do in the future. Maybe one day they want to transform Mars, so they have to find me too?"

"It's more work for those who can." Pang Wei smiled and patted Lin Xiao's shoulder, and then walked into the laboratory with Lin Xiao.

There are also other people in the laboratory, and these people are Pang Wei's quantum communication research team.

When these people saw Lin Xiao, their faces showed excitement and admiration, and they all shouted: "Hello, Chief Lin!"

"Hello." Lin Xiao smiled and nodded towards them.

At this time, one of them asked again: "Chief Lin, are you going to take us to study the quantum communication between the earth and the moon?"

Lin Xiao smiled slightly and said, "Why can't it be Earth Fire if it's just Earth Moon?"

"Ah this..."

These people were stunned for a moment. Do they still want to study the quantum communication between the earth and Mars?
This difficulty is completely an increase in the quantitative level.

After all, one is 40 million kilometers, and the other is at least 5500 million kilometers. Usually, it is 1 million kilometers away. This kind of difficulty is not insignificant.

But then Lin Xiao smiled and said: "Of course, I'm just telling you that we need to set our goals in the longer term, but for now, let's just realize the quantum communication between the earth and the moon. "

Hearing this, the researchers breathed a sigh of relief, then nodded, and replied, "Yes! Chief Lin!"

At this time, Pang Wei also came out with a smile and said: "Okay, you guys, think about Chief Lin's past achievements, even if we really want to engage in Earth Fire Quantum Communication, if we have the help of Chief Lin, we will really Did it come out?"

Hearing Pang Wei's words, these researchers thought, it seems to be the same reason?
Ever since, their eyes on Lin Xiao became more eager.

Hey, if they can really realize the ultra-long-distance quantum communication between the earth and fire, then they will be amazing.

Lin Xiao shook his head amusedly, and stopped talking nonsense, and then said: "Okay, let's not talk about these things, let me talk about the key points of our project first."

Hearing that Lin Xiao was going to make a point, these researchers all became serious and looked at Lin Xiao, and Pang Wei also came to the side and looked at Lin Xiao.

"Now the quantum communication distance we realize is very limited. I believe everyone knows the reason."

"In the process of quantum teleportation, the quantum state that we carry quantum information will be subject to quantum decoherence, which will eventually cause our transmission to fail."

"And this quantum decoherence effect is relatively strong on the surface of our earth, because on the surface of the earth, the effect of 'observation' is relatively strong, so this also makes it very difficult for us to realize quantum communication on the surface of the earth. Difficult, need the help of satellites."

As we all know, "quantum" is uncertain, and once it is observed, it will collapse, just like our time, the future is uncertain, but when the future becomes the present and human beings can observe it, it becomes certain up.

It's just that the "observer" is not limited to human beings. Anything that can cause the measurement of "quantum" will lead to the disappearance of this quantum entanglement.

This can also be used to understand the confidentiality of quantum communication, because in the process of quantum communication, when the sender sends a message, the only legal observer is the receiver, that is to say, only the receiver can observe ', in order to get the correct information.

And once a third party wants to intervene in this process, the "observation" of the third party will cause its quantum state to collapse, and because of its illegality, it will not be able to get the real news, while the original sender and receiver Because of the change of the quantum state, it is also noticed that a third party is trying to observe. In simple terms, it means that quantum communication also has the function of anti-eavesdropping.

All in all, other observations will cause the information transmitted by quantum entanglement to not be transmitted normally, or even destroy this quantum entanglement state.

"So, what we have to do is to make a quantum entanglement controller and observation device that can reduce external interference."

"In this way, we can achieve more long-distance quantum communication."

Lin Xiao said.

"How to do it?" Pang Wei asked at this time: "Do you want to add teleportation with more degrees of freedom?"

"Yes, and only this method can make our quantum teleportation more stable and suffer from lower decoherence effects."

Lin Xiao nodded and said with a smile.

"But you should also know that the more degrees of freedom you increase, the more difficult it is to achieve."

"Of course I know." Lin Xiao nodded and said, "I also remember that in 2015, the team led by you, Academician Pang, realized the world's highest brightness spin-orbit angular momentum super-entanglement source measurement device."

Hearing Lin Xiao mention this, Pang Wei smiled. The project he completed at the beginning can be regarded as one of the most commendable of his many achievements.

Because after realizing the single-freedom quantum teleportation for the first time in 1997, his achievement realized the multi-freedom quantum teleportation, that is to say, by observing the spin direction and orbital angular momentum of the photon, All can receive information, which improves the stability of quantum communication and extends the distance.

And this achievement was also evaluated as the top ten major breakthroughs in the field of physics that year.

But at this moment, Lin Xiao narrowed his eyes and said, "But just two degrees of freedom are not enough. There are many degrees of freedom. We need to continue to make breakthroughs to truly realize interstellar quantum communication."

"Do you want to realize three degrees of freedom?" Pang Wei looked at Lin Xiao's eyes and said incredulously.

The improvement of any degree of freedom represents an exponential expansion of the difficulty.

In 1997, he completed quantum teleportation with one degree of freedom 18 years later, and he completed quantum teleportation with two degrees of freedom, and the more degrees of freedom, the more difficult it is to complete.

If it is three degrees of freedom, God knows how difficult it will be.

However, at this time, Lin Xiao's calm voice remembered: "No, I want to achieve five degrees of freedom."

"Spin, orbital angular momentum, polarization, wavelength, and momentum."

Now, not to mention the people present, but if Lin Xiao's idea is spread, the quantum information world will probably be boiling.

Because there is no doubt that to achieve quantum teleportation with five degrees of freedom, for the current quantum information community, it is simply equivalent to the "forever 50 years" that was spread by word of mouth when controllable nuclear fusion has not yet been realized.

Basically tantamount to saying it's impossible.

All the people present swallowed their saliva, and suddenly felt a kind of Alexander. The difficulty of realizing the quantum communication between the earth and the fire that Lin Xiao said just now seems to be similar to this difficulty?

If this really achieves five degrees of freedom, it seems that they can really realize the quantum communication between the earth and fire?

And Lin Xiao saw the appearance of these researchers as if they were facing a formidable enemy, finally smiled and said, "Don't be so worried, everyone, let's take it slowly."

"And old Pang, you said just now, let me do whatever I want."

Pang Wei shook his head helplessly, and said, "Yes, yes, hey, you can count me on your boat."

Lin Xiao laughed, otherwise, how could I let you experience my original feelings?
It's just a pity that the original instigator, academician Li Gang of the Institute of Plasma, seems to have retired, otherwise, he really wants to find a project sometime to bring Li Gang into it.

He sighed in his heart, and then he said: "Then, let's not talk nonsense, let's start with the first item, how to control these degrees of freedom stably."

Then, he walked to the small blackboard beside him, found a pen, and began to write on it.

"First of all, let's start with the discussion of quantum decoherence, how to deal with the quantum decoherence effect..."

【Ex(t)|Ey(t)∝e...】

As Lin Xiao wrote more and more formulas on the blackboard, Pang Wei's eyes lit up after serious thinking.

seem……

In fact, Lin Xiao was already prepared?
It didn't just start off without a second thought.

Thinking of this, he also smiled slightly, this is the chief scientist who convinced them all.

Then he motioned to the others to let them learn from Lin Xiao, and he also took out a pen and paper, and began to follow Lin Xiao's steps to think.

And this topic about how to realize the quantum communication between planets officially started.

……

(End of this chapter)