Chapter 224: He is an experienced programmer
During this period of time, Xu You not only understood the entire work flow, but also learned some problems in the design, production and manufacturing 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 quantum bits and maintaining single-bit fidelity.
"As the number of qubits increases, the number of z control lines, or magnetic field control lines, on the superconducting quantum chip also increases. This leads to an increase in magnetic field crosstalk between the various control lines, which affects the fidelity of the single bit and further affects the computing power of superconducting quantum computing."
Speaking of this issue, Han Shubin was somewhat helpless.
In fact, there is a very simple way to solve this problem.
That is to reduce the number of quantum bits.
But this would limit the potential capabilities of quantum processors.
Xu You doesn't have any very good solution for this yet.
Through close contact with Han Shubin these days.
Xu You highly recognizes Han Shubin's abilities.
It can be said that this is one of the most capable scholars Xu You has ever met.
Like the scholars who attended the academic exchange meeting a few days ago, Xu You did not have close , and did not know what their status was in their scientific research work.
Han Shubin really understands every detail of quantum computers very clearly.
We also have our own unique solutions to many problems.
Even the problem that Han Shubin couldn't solve, it wasn't so easy for Xu You to solve either.
"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 give it a try. In some previous scientific research projects, I have also solved some key problems through modeling and simulation."
Xu You did not explain in detail to Han Shubin the specific solutions, including aerospace, materials, superconductivity, etc.
"Okay, we can discuss this in detail with the engineers in the software department. I am mainly engaged in quantum computing and quantum information. I am not an expert in some computer knowledge," said Han Shubin.
Xu You knew that the "layman" Han Shubin mentioned was definitely more than just a layman.
It is similar to what Xu You said "have a rough understanding".
Han Shubin brought 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 Engineer Chang."
Xu You looked at Chang Xiaoping.
At first glance, you can tell that this is definitely a very powerful programmer.
The amount of hair he has is not even half of what Zhao Weijia had before the hair transplant.
"Hello, Chang Gong, I'm Xu You."
"Hello Xu You, please take a seat."
Chang Xiaoping was naturally aware of Xu You's reputation.
However, in Chang Xiaoping's impression, Xu You was studying physics and had made great achievements in the field of superconductivity.
I wonder if Xu You came to the software department of the project team today to talk to me about something.
"Chang Gong, Xu You wants to learn 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 what Han Shubin said, Chang Xiaoping finally understood.
It turns out that Xu You wanted to try to solve this problem.
"We have proposed this solution before. However, we have no problem with the simulation modeling of quantum chips, but the simulation of z control line crosstalk is not so easy to do."
Chang Xiaoping said confidently that he was definitely one of the best in China in terms of software .
If even Chang Xiaoping can't solve this problem, then we can only say that this direction is very difficult.
"You two can have a good exchange. Xu You is very capable in computers, and many of his scientific research projects use knowledge of simulation modeling."
"Okay, Academician Han."
Being able to receive such 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 of quantum chips and z control line crosstalk.
After chatting with Xu You for a while, Chang Xiaoping found that Xu You had indeed mastered this very well.
Chang Xiaoping would have no doubt that Xu You was an old programmer.
"Xu You, I thought your main research area wasn't physics? How come you're so good at computers?"
"Because computers are so important, many scientific research topics are difficult to solve without computer knowledge. When I was in college, I learned some computer knowledge from a professor and worked on my doctoral thesis. Of course, I didn't get a degree."
Listening to Xu You's words, Chang Xiaoping couldn't help but feel surprised.
Just by taking a minor subject, you can reach the level of a doctorate.
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 quantum chips, we can model them based on their actual structure, and the degree of restoration is very high. But crosstalk is different. For example, the vacuum box, dielectric substrate, superconducting layer, etc. are all very difficult to simulate. 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 made and explained it to Xu You.
This model is quite well made and the degree of restoration is not low.
However, when it comes to quantum chips that require extremely high precision, if the degree of restoration cannot be achieved to a very high level, it will be difficult to help solve practical problems.
"Chang Gong, can you give me a copy of the simulation model of the quantum chip? I want to study it carefully."
Chang Xiaoping did not answer directly, but glanced at Han Shubin.
"Of course you can. 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. As for the z control line crosstalk, I want to actually measure it and get the most accurate parameters."
"Well, you can just go and take the test."
Han Shubin can be said to be completely open about Xu You.
If it weren't for Xu You, the project team would never have the courage to research 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 do you manage to keep your hair from falling out while typing code? Don't mention age. I started losing my hair when I was in my twenties."
