Chapter 468: One-way function controversy, lithium-sulfur battery completed

"Well... I should have told them this possibility just now. Then the mathematicians might be able to come up with a solution?"

When he was struggling with this incredible thing, Lin Xiao couldn't help but have the idea that although he was powerful enough, he was not sure about this kind of problem. Maybe he could get some results by brainstorming.

But in the end he shook his head, forget it.

After all, this was what the system told him, and it was precisely because the system told him that he had this feeling of doubt, and it was "half belief", not "convincing belief".

He even suspected that the system's words were just to mislead him, but obviously, judging from the system's past performance, the possibility of such a thing was quite low.

However, now he has this idea in his mind. If he tells other mathematicians at that time, other mathematicians may still suspect that he is crazy.

After all, he now thinks that he is crazy.

But at this moment, his eyes suddenly lit up, and he asked the system: "System, how many truth points are needed to solve this problem?"

The system replied after a moment: "Considering the host's current mathematics and physics levels, 500 truth points are required to answer this question."

"My lord? Five hundred truth points?"

Hearing the price, Lin Xiao was immediately shocked. Good guy, is this problem so expensive?

He originally thought about buying it if it was below 100 truth points, but he didn't expect that the price would persuade him to give up.

And what the system also says is to consider his current mathematics and physics levels.

He is already at Level 8 in Mathematics and Physics, but he still needs 500 truth points. This is a bit outrageous.

"It seems that there are still some more advanced theories hidden."

Finally, he frowned and thought about what kind of advanced theory it would be. According to the system, this also involves physics. Could it be that some more advanced physics theories are needed?

After thinking for a moment, his brows soon widened again.

"Forget it, let's not worry about it for now. The research commissioned by Academician Pang has not been completed yet."

He shook his head, no longer thought about it, and restarted his original research on the qubit control model.

Of course, he also knew that the one-way function would probably become a long-term research project for him in the future.

He didn't know where the final answer would lead, but he thought it would be a more important node in the truth he was pursuing.

…

Time passed quickly.

What happened at this International Congress of Mathematicians has also attracted the attention of many people.

After all, although Lin Xiao did not go to participate in this International Congress of Mathematicians, he was able to enjoy such treatment, which had to make many Chinese netizens feel a sense of honor. Who made Lin Xiao... Where is their chief scientist?

Since then, netizens have discussed this matter on the Internet.

"As expected of Lin Shen, he did not attend the International Congress of Mathematicians, but during the closing ceremony, Lin Shen was specially invited to participate in this way."

"After all, Lin Shen is still very important to the International Congress of Mathematicians. None of his previous participations left traces that can be engraved in the history of mathematics. 』

"Lin Shen: I am no longer in the mathematical world, but my legend is still alive in the mathematical world."

"Who said Lin Shen is no longer in the mathematics world? But don’t forget, Lin Shen only participated in less than ten conferences, even the closing ceremony, and then solved a Millennium Prize problem, but he is still in the world of mathematics.」

"Indeed, this is another Millennium Problem. To be honest, God Lin has solved four of the seven Millennium Problems, and there are still two left that have not been solved. God Lin will not plan to give them all." Solve it? 』

"Maybe?" 』

"By the way, what's the significance of this millennium problem that Lin Shen has solved again?" 』

"I'm a person in the banking industry, and I'm responsible for password security. To put it simply, people's property will become more secure in the future. Of course, it's not just about banks, there are other things that need to use passwords. In places like this, it will become extremely difficult for hackers to crack passwords. In this way, it will also become difficult for hackers to hack into your computer or mobile phone. 』

"I, Cao, am so powerful? 』

"Of course it's awesome. We held a meeting today about this one-way function given by Lin Shen. Next we may try to change all the encryption methods of our internal core system. All encryption methods currently used are It's safer to have no one-way functions at all. 』

"This is really great! Banks are safer, which is better for all of us.』

"I thought so at first, but after looking at my balance, well, it doesn't seem like I need to worry about whether it's safe or not, because the bank can't control my balance, and my balance is 0."

"It hurts my heart, old man, I've reached the point of pain."

"..."

As this netizen from the banking industry said, the emergence of one-way functions has attracted the attention of relevant industries.

Passwords are closely related to humans living in the information age. For most ordinary people, a password may be just an ordinary string of numbers or a string of uppercase and lowercase letters, but in fact, it determines World harmony.

Therefore, an encryption method that is difficult to crack can better consolidate this harmony.

That’s why Lin Xiao’s one-way function has such meaning.

In fact, the hash function used in current login passwords for various software is an encryption method that utilizes the principle of one-way functions. Of course, this encryption method is less reversible than one-way functions. It is relatively easy to say.

Just like the birthday paradox that Lin Xiao once mentioned, the birthday attack developed based on the birthday paradox can have a greater impact on the security of hash function encryption. Although the birthday paradox cannot be cracked, It will still have a certain impact.

Once a one-way function is used for encryption, this situation can be completely avoided. Basically, it can be said that only those who have truly mastered the plain text of the password can use it.

As a result, major manufacturers have begun to try to use this one-way function to encrypt their own core data.

Of course, due to the extremely difficult reversibility of one-way functions, it is actually relatively unsuitable for encryption. Therefore, for these manufacturers, banks, government departments, etc., they basically just use this one-way function. To protect some of the most core data, through this method, they can better protect their core data, even some top-secret data that is best never known to anyone.

Therefore, for some people with such special needs, they will even forget the password when encrypting it. In this case, no one will know it in vain.

…

Of course, although Lin Xiao could guess this situation, he didn't have the time to pay attention to these things now.

Because of the reminder from the system, he would focus on this issue for a long time, but in the end he adjusted his mentality and seriously studied the problem of quantum computers.

Just like that, finally at the end of October.

"Phew! Finally got it done."

Looking at the finally completed model, Lin Xiao let out a sigh of relief. In the end, he completed a mathematical model that can control qubits in quantum computers based on the form of P=NP.

Although he has falsified that P is not equal to NP by finding a one-way function, the original proof requirement of the original problem of P=NP is that P is equal to NP in all cases, so at this time, he only needs to find a counterexample. This can be falsified, but there are also some special cases where P=NP, and now he has found this special case to solve the problem.

All in all, there is basically no problem with this model, but for now, he cannot fully guarantee that this model will work. Next, we need to see how it is actually used.

Thinking of this, he then took out his mobile phone and called Pang Wei.

"Academician Pang, I have completed a model of what you asked me to do. I will take the model to your place tomorrow. Can you take a look?"

Pang Wei's surprised voice suddenly came from the opposite side: "Chief Lin, have you done it?"

"Well, basically, we have to see how it runs on your quantum computer."

As he spoke, Lin Xiao couldn't help but sigh: "But having said that, the matter you gave me, Academician Pang, was really difficult. It actually took me so many months."

After hearing Lin Xiao's emotion, Pang Wei on the opposite side was silent for a moment, then laughed dryly and said, "Haha, Chief Lin, you really know how to joke."

"Why is this a joke? I'm not joking." Lin Xiao said.

"Uh... Okay, okay, Chief Lin, let's talk about this difficult matter later." Pang Wei quickly changed the subject.

It took a few months to solve such a complicated problem, and now you are telling him that this problem is difficult?

Forgive him for thinking that Lin Xiao came here to show off to him at first. If he hadn't suddenly thought of Lin Xiao's strong record, he might have hung up the phone directly to avoid being shocked.

Then he returned to the topic: "Well, recently we are building a new quantum computer. This new quantum computer will use a new chip, and especially this new chip also uses A brand new chip architecture produced by us."

Lin Xiao was stunned, "A brand new domestic structure?"

"It won't be the chief architect, right?"

"Eh? Do you know that too?" Pang Wei was also stunned, and then suddenly thought: "No, this architecture is called the chief architecture. Could it be related to you? But I remember that its founder is not another person like you. Young people of the same age?"

Lin Xiao laughed, and then said: "You are talking about Kong Hua'an, right? He and I are good friends."

"So that's it." Pang Wei couldn't help but sigh: "No wonder geniuses always appear together. This sentence is quite correct."

Lin Xiao smiled and then said: "Academician Pang is also a genius. He also said the same when I chatted with Mr. Yang before."

Pang Wei smiled and said, "It's all Mr. Yang who's praising me."

Speaking of this, Pang Wei said quite nostalgically: "I still remember that one time, when I happened to take an elevator with Mr. Yang, Mr. Yang asked me which unit I was from, and I said the one from the University of Science and Technology."

"Then Mr. Yang said, 'There is a guy named Pang Wei in your school who is doing a good job.' I started laughing at that time."

"Oh? This kind of thing has happened before." Lin Xiao couldn't help laughing.

"Yeah." Pang Wei smiled and said, "Okay, I won't say much more. Our new quantum computer will probably take some time to build, about a month. I will contact you then."

"good."

Lin Xiao replied and then hung up the phone.

In the next month, Lin Xiao continued to optimize his model. At the same time, he did not forget to research on lithium-sulfur batteries.

Regarding the research on solid electrolytes for lithium-sulfur batteries, the progress is slower than that for proton batteries. This has a certain relationship with the difficulty of research on solid electrolytes. Of course, it is also due to the fact that Lin Xiao has made most of the research about solid electrolytes during this period. My thoughts were focused on the qubit control model and the strange one-way function.

Now, he finally has time to focus more on lithium-sulfur batteries.

That's it, about half a month later.

"nailed it!"

In the laboratory.

They looked at the battery reaction pool that had been set up.

There is a solid object in the middle, and this solid object is naturally a solid electrolyte. This is a modified lithium iodide. It is doped with some other special substances to give it the characteristics of a solid electrolyte, or fast ions. Characteristics of conductors.

That is to say, it has ionic conductivity and low ionic conductivity activation energy comparable to liquid electrolytes.

The biggest problem with solid electrolytes is whether the flow of ions inside them can be as smooth as in the electrolyte. Once this problem is solved, it will have the ability to become a solid electrolyte. Then it will need to solve some of the shortcomings of a compound. That's it.

Of course, in addition to this solid, there are two solid rods next to it, one is the metallic lithium rod. Of course, the metallic lithium rod must not be in direct contact with the air, because the moisture contained in the air will A more violent reaction may occur, causing danger.

In addition to metallic lithium, there are sulfur carbon rods.

Since the sulfur element will have a certain impact on the battery during the reaction process of the lithium-sulfur battery, Lin Xiao specially developed such a sulfur carbon rod to avoid the impact of sulfur element during the reaction.

In this way, all the shortcomings of lithium-sulfur batteries have been solved.

"Then, it's time to witness the miracle!"

Kang Chengning and others had excitement on their faces, and then they started the experiment.

The external circuit is connected, the reaction begins, and the current and voltage are quickly detected on the meter.

Of course, this is not over yet. Next, they need to observe the discharge process for several hours and test various data.

Just like that, as time passed, a few hours later.

"It's been detected! The energy density is 2,200 watt hours per kilogram!" Ma Bin shouted excitedly.

"2200 watt hours? Beautiful!"

Others also became happy.

Although the theoretical energy density of lithium-sulfur batteries is 2600 watt-hours per kilogram, it is also said to be a theoretical energy density after all.

Just like in the development of lithium-ion batteries, the energy density can be continuously improved because it has not yet reached the theoretical energy density. In this process, various battery components, binders and other substances will affect to its actual energy density.

So the data they calculated now is 2200 watt hours per kilogram. Of course, if it is further made into a commercial battery, the loss will be even more. In the end, half of 2600 watt hours per kilogram is considered good. .

"However, as long as it can be maintained above 1,000 watt-hours per kilogram."

Lin Xiao on the side also showed a satisfied smile.

Compared with proton batteries, lithium-sulfur batteries obviously have lower energy. However, the key problem is that proton batteries require colloidal electrolytes, proton exchange membranes, and new hydrogen storage materials. The cost is inherently high, so they are relatively more suitable for use. On electric vehicles as well as some large facilities.

The cost of lithium-sulfur batteries is relatively low. Of course, the energy density is also relatively low. However, it can be used in mobile devices such as mobile phones, so the profit will not be too small.

"Then, let's see what BYD and CATL will choose."

…

A belated chapter. 4600 words, the two chapters add up to 9600 words, the coding speed is too slow (╥╯^╰╥)

(Take a day off tomorrow and have a day off)