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During this period of time, Xu You not only understood the entire workflow, but also some problems in the design and manufacture of quantum chips.

Among them, the question raised by Han Shubin is the most critical and one of the most difficult to solve.

It can be said that it is a contradiction between the increase in the number of qubits and the maintenance of single-bit fidelity.

"As the number of qubits increases, so do the number of z control lines, or magnetic field control lines, on the superconducting quantum chip. This leads to increased magnetic field crosstalk between individual control lines, which affects single-bit fidelity, And further affect the computing power of superconducting quantum computing."

Speaking of this issue, Han Shubin was a little helpless.

In fact, there is a very simple way to solve this problem.

That is to reduce the number of qubits.

But in this way, it will limit the potential capabilities of quantum processors.

In this regard, Xu You also has no very good solution for the time being.

Through close contact with Han Shubin these days.

Xu You recognized Han Shubin's ability very much.

It can be said that this is one of the most capable scholars that Xu You has come into contact with.

Like those scholars at the academic exchange meeting a few days ago, Xu You didn't have close contact with them for a long time, and he didn't know what kind of state they were in scientific research work.

And Han Shubin really knows every detail of the quantum computer very clearly.

In many problems, also have their own unique solutions.

Even Han Shubin couldn't solve the problem, and Xu You couldn't solve it so easily.

"Academician Han, how is our modeling and simulation technology for superconducting quantum chips?" Xu You asked.

"The modeling and simulation technology of quantum chips is relatively mature. Why, Xu You, do you want to solve this problem through modeling and simulation?"

"Yes, I think I can try it. In some previous scientific research projects, I have also solved some key problems through modeling and simulation."

As for those specific solutions, including aerospace, materials, superconductivity and other parts, Xu You did not elaborate with Han Shubin.

"Okay, we can discuss this with the engineers in the software department. I am mainly engaged in quantum computing and quantum information. I am also an amateur in computer knowledge." Han Shubin said.

Xu You knew that what Han Shubin referred to as "a layman" was definitely not as simple as a layman.

It is similar to Xu You's "slight understanding".

Han Shubin took Xu You to the software department of the project team.

"Xu You, this is the person in charge of the software department, Chang Xiaoping, you can just call him Chang Gong."

Xu You looked at Chang Xiaoping.

At first glance, I knew that this was definitely a very powerful programmer.

His hair volume is not even half that of Zhao Weijia before the hair transplant.

"Hi, Chang Gong, I'm Xu You."

"Hello Xu You, please sit down."

Chang Xiaoping naturally knew about Xu You's reputation for a long time.

However, in Chang Xiaoping's impression, Xu You studied physics, and his achievements in the field of superconductivity were very impressive.

I don't know if Xu You came to the software department of the project team today, and he has something to ask for himself.

"Chang Gong, Xu You would like to know about the simulation modeling part of the quantum chip. I also want to ask, is it possible for us to use simulation modeling to solve the problem of magnetic field crosstalk."

Hearing what Han Shubin said, Chang Xiaoping finally understood.

It turned out that Xu You wanted to try to solve this problem.

"We have also proposed this plan before. However, we have no problem with the simulation modeling of quantum chips, and the simulation of z control line crosstalk is not so easy to do."

Chang Xiao said that in terms of software, he is definitely the top in China.

If even Chang Xiaoping can't solve this problem, it can only be said that this direction is very difficult.

"You guys can have a good chat. Xu You is very capable in computers, and many scientific research projects have used the knowledge of simulation modeling."

"Okay, Academician Han."

With such an evaluation from Han Shubin, Chang Xiaoping also believes that Xu You may indeed have a strong ability in this regard.

Next, Chang Xiaoping and Xu You discussed the simulation modeling of crosstalk between quantum chips and z control lines.

After chatting with Xu You for a while, Chang Xiaoping found out that Xu You really has a solid grasp on this.

Chang Xiaoping would not doubt that Xu You was an old programmer.

"Xu You, I don't think your main research is physics? How come computers are so good at it?"

"Because the importance of computers is too strong, many scientific research projects are difficult to solve without computer knowledge. When I was in college, I asked a professor to learn computer knowledge by the way, and I did a doctoral graduation project. Of course, The kind without a degree."

Hearing Xu You's words, Chang Xiaoping couldn't help being surprised.

Just a minor subject can reach the level of a doctor.

Xu You's learning ability is really scary.

Next, Chang Xiaoping and Xu You explained why the simulation modeling of z control line crosstalk is not easy to achieve.

"For the quantum chip, we can model it according to its actual structure, and the degree of restoration is very high. But the crosstalk is different. It includes vacuum boxes, dielectric substrates, superconducting layers, etc., which are very difficult to It is simulated. If the simulation degree of the model is not high enough, the results will be completely meaningless.”

Chang Xiaoping found out the crosstalk simulation model they had made before, and explained it to Xu You.

Speaking of this model, it is still well done, and the degree of restoration is not low.

However, on the issue of quantum chips that require extremely high precision, if the degree of reduction cannot be very high, it is really difficult to help solve practical problems.

"Chang Gong, can you give me a copy of the simulation modeling of the quantum chip? I want to study it carefully."

Chang Xiaoping did not answer directly, but glanced at Han Shubin.

"Of course, since I invited you over, I will naturally not keep everything about the whole project a secret from you," Han Shubin said.

"Okay, thank you Academician Han for your trust. There is also the crosstalk of the z control line. I want to actually measure it to get the most accurate parameters."

"Well, you can test it."

Han Shubin had no reservations about Xu You.

Without Xu You, the project team would never have had the courage to study quantum computers with more than 1,000 bits.

After obtaining Han Shubin's consent, Chang Xiaoping copied the simulation model of the quantum chip to Xu You.

While copying the data, Chang Xiaoping said:

"Xu You, how did you manage to keep your hair from falling out while typing code? Let alone age, I started to lose my hair when I was in my twenties."