Chapter 226: At first glance, he looks like an old programmer

During this period of time, Xu You not only understood the entire work process, but also learned about some problems in the design and production 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 there is a contradiction between the increase in the number of qubits and maintaining single-bit fidelity.

"As the number of qubits increases, the z control lines on the superconducting quantum chip, that is, the magnetic field control lines, also increase. This causes the magnetic field crosstalk between the various control lines to increase, thus affecting the fidelity of single bits.

And further affects the computing power of superconducting quantum computing."

When it comes to this problem, Han Shubin is also a little helpless.

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

That is to reduce the number of qubits.

However, this will limit the potential capabilities of quantum processors.

In this regard, Xu You doesn't have any very good method for the time being.

Through the 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 Xu You has ever come into contact with.

Like those scholars at the academic exchange meeting a few days ago, Xu You did not have close contact with them for a long time, so I don’t know what kind of status they are in during their scientific research work.

And Han Shubin really understands every detail of quantum computers very clearly.

He also has his own unique solutions to many problems.

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

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

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

"Yes, I think I can give it a try. 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 aspects, Xu You did not go into details with Han Shubin.

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

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

It is similar to what Xu You said about "a little understanding".

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

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

Xu You looked at Chang Xiaoping.

At first glance, you can tell that this is definitely a very powerful programmer.

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

"Hello, Chang Gong, my name is Xu You."

"Hello Xu You, please take a seat."

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

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

I wonder if Xu You came to the software department of the project team today because he has something to ask for.

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

After hearing Han Shubin's words, Chang Xiaoping finally understood.

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

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

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

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

"You guys can have a good exchange. Xu You is very capable in computers, and many scientific research projects use simulation modeling knowledge."

"Okay, Academician Han."

Being able to receive such an evaluation from Han Shubin, Chang Xiaoping also believes that Xu You may indeed have strong abilities in this area.

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

After chatting with Xu You for a while, Chang Xiaoping discovered that Xu You did have a very solid grasp on this matter.

Chang Xiaoping would not have any doubts about Xu You being an old programmer.

"Xu You, I don't think your main study is physics? Why are you so good at computers?"

"Because computers are so important, many scientific research projects are difficult to solve without computer knowledge. When I was in college, I learned some computer knowledge from a professor and worked on my PhD graduation project. Of course,

The kind without a degree."

Listening to Xu You's words, Chang Xiaoping couldn't help but feel surprised.

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

Xu You's learning ability is really a bit scary.

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

"For the quantum chip, we can model it based on its actual structure, and the degree of reduction is very high. But crosstalk is different, including the vacuum box, dielectric substrate, superconducting layer, etc., which are very difficult to

Simulated. If the simulation degree of the model is not high enough, the results will be completely meaningless."

Chang Xiaoping found the crosstalk simulation model they had previously done and explained it to Xu You.

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

However, when it comes to quantum chip problems that require extremely high accuracy, if the degree of reduction cannot be very high, it will indeed be 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 here, everything about the entire project will naturally not be kept 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 and get the most accurate parameters."

"Well, you can just take the test."

It can be said that Han Shubin has no reservations about Xu You.

Without Xu You, the project team would never have had the courage to study a quantum computer 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 do you manage to type code without losing your hair? Not to mention my age, I started losing my hair when I was in my twenties."
Chapter completed!