Chapter 412: That feeling of fear is back
The research on the Haidao-2 quantum computer has been nearly half completed, and it will not be too long before the next generation of quantum computers comes out.
If nothing unexpected happens, we will continue to maintain our leading position in the field of superconducting quantum computers.
Research on optical quantum computers is expected to greatly increase the upper limit of quantum computing speed.
With the previous success of Loongson G1 as a foundation, Xu You is also full of confidence in this research.
After making these decisions, Xu You once again convened members of the "Mathematical Classics" project team and came to Jijing University to hold another meeting.
At the meeting, Xu You clarified the direction of the project, formulated a plan for the next stage, and completed the assignment of tasks.
Wang Xiangwu's quantum physics laboratory will play an important role in the "Suanjing" project.
In order to facilitate Han Shubin and his team's research at Jijing University, Xu You also specially arranged for Cui Ying to help them reserve a temporary room in the Jijing University staff quarters.
If the work goes on too late, they can live directly on the Jijing University campus.
After arranging all the tasks, everyone entered into an intense research state.
If we want to create a high-performance, high-application-value optical quantum computer, the most important thing is to solve the problem of optical quantum chips.
The photonic quantum chip used in photonic quantum computers is very different from the Loongson G1 used in Fulon mobile phones.
Although Loongson G1 is a programmable optical quantum chip, in order to be able to program it, Xu You had to sacrifice the chip's computing power during research and development .
It greatly simplifies the complexity of photonic quantum chip circuits and reduces the scale of circuits.
The same method will definitely not work if applied directly to optical quantum computers.
In order to solve these problems, Xu You, Han Shubin, Wang Xiangwu and other experts from various industries began to study ways to solve the problems.
"Teacher Xu, as the complexity and scale of integrated photonic quantum chip circuits increase, the calibration of phase shifters on photonic quantum chips has become a very difficult problem."
From a professional perspective gave a key issue in current research.
"Yes, this is indeed a very tricky problem. When I was researching the Loongson G1, I also simplified the circuit of the optical quantum chip to avoid this problem."
In the following research, this is bound to be an issue that cannot be avoided.
At this time, the brain's simulation skills are of no use.
Xu You tried hard to obtain all the information he could get, and thought repeatedly in a state of deep learning.
"The key to the problem is to be able to calibrate the phase shifter."
Only in this way can the high fidelity of light quanta be guaranteed.
In actual photonic quantum chip circuits, phase shifters use multiple cascade modes, and Xu You calibrates multiple phase shifters at the same time.
Before that, Xu You needed to solve the calibration problem of a single phase shifter.
Under the state of deep learning, Xu You derived the transmission matrix of the multi-mode interference coupler through a series of derivations.
Xu You found Zhao Weijia and arranged the next work for him.
"Teacher Zhao, we need to build this photon circuit to verify the current on the phase shifter."
After becoming the project leader, Xu You also began to pay special attention to various titles.
In this case, it is obviously inappropriate to call Zhao Weijia "senior brother".
"Okay, Mr. Xu."
Zhao Weijia did not relax at all during the experiment because of their relationship.
In scientific research, we must maintain a sense of awe and take every detail seriously.
After many days of hard work, Xu You's first inference was successfully verified.
"Teacher Xu, by measuring the ratio of the output power of the two ports to the total output power, we have found its relationship with the current applied to the phase shifter, which is exactly consistent with the theoretical formula derived previously. By scanning the current I and measuring the splitting ratio T, and performing nonlinear fitting on T and I, we can complete the calibration of the phase shifter."
"Very good, the problem of calibrating a single phase shifter has been solved. Next, it is the problem of calibrating multiple phase shifters."
After learning the result, Xu You, Wang Xiangwu, Han Shubin and others were very excited.
However, Xu You himself knew that the difficulty of subsequent research would increase exponentially.
Han Shubin, who has experience in optical quantum computer research, is the person who knows the difficulty best.
Over the years, Han Shubin has never made any breakthrough on this issue.
And Xu You actually solved the first problem in such a short time.
…
"Teacher Xu, the quantum state of the phase shifter has been verified and confirmed to be consistent with the formula we derived earlier."
After another stage of research, the project team solved several research problems one after another.
We are one step closer to successfully solving the calibration of multiple phase shifters.
At this time, we encountered great challenges in calculating fractional ratios, realizing unitary transformation, and predicting the phase of each phase shifter.
At this time, Xu You stood up again.
After a long period of training, Xu You can now enter the flow state anytime and anywhere and complete efficient thinking and analysis.
"Professor Xu...what happened?"
It was the first time that Han Shubin saw Xu You in such a dazed state.
"This is a personal habit of Mr. Xu. When he is concentrating on thinking about a problem, he will put aside all distractions and devote himself to the problem. Don't worry about him, just let him think slowly."
Zhao Weijia was already used to Xu You's condition and didn't feel surprised.
But compared to before, Xu You seemed to have "entered a state of perfection", and his state was even more mysterious than before.
Han Shubin found this a little bit unbelievable. As expected, this kind of world-class genius had different working habits from ordinary people.
At this moment, Xu You seemed to have discovered something and suddenly recovered from that "sluggish" state.
Xu You picked up the pen and wrote something quickly on the paper.
A few minutes later.
Xu You put down his pen and smiled with satisfaction at the conclusion he drew on the paper.
"I figured it out. I finally figured it out!"
Zhao Weijia heard the voice and was the first to come over.
"Sure enough, it's still the same as before. I can't understand it at all."
Zhao Weijia vaguely remembered the fear he had felt when he was ruled by Xu You.
Every time Xu You came up with some strange formula, Zhao Weijia was always confused.
