Chapter 225 I have some new ideas
Xu Qingzhou went to the dormitory to rest for half an hour. He arrived at the laboratory at 1:50 and met the director of the laboratory, Academician Ma Liangzai, and Professor Chang.
Academician Ma Liangzai looked at Xu Qingzhou and marveled: "You are a bit scary for being young, Old Chang, we are still chewing on books at this time."
"Yes, little Xu Qingzhou Director Ji and the others hired him from the School of Science and Technology," Professor Chang said.
Xu Qingzhou said with a smile: "Thank you for your praise. I still need to learn more from your seniors."
Professor Chang said: "Xiao Xu, your experiment is very meaningful. According to your We have made subtle adjustments to the signal source based on the theoretical model of the impact of the spatial separation effect on compression. "
"Currently, the stability of the signal channel has been improved by a full 1.5%."
"It would be great if I can help." Xu Qingzhou said, which was similar to his original estimate of 1.5%. In such a large-scale experiment, even 0.1% may have a decisive impact.
Professor Chang asked: "Has Xiao Qi told you about the mission?"
"Yes, I told you, I will talk to Professor Zhong first."
Professor Chang nodded, "You follow Professor Zhong first. Judging from those papers, matrices and linear algebra are just the areas you are good at. We will talk about other experiments after you are familiar with the project."
Beijing University Institute of Physics The year was really a bit long, but it was different now. He saw hope in Xu Qingzhou, so he thought that if he had the opportunity, he would expose Xu Qingzhou to other experiments and accumulate experience in advance.
"Okay, thank you Professor Chang." Xu Qingzhou smiled and nodded.
Academician Ma and Professor Chang encouraged Xu Qingzhou and then began to call everyone out for a meeting.
There is no empty talk in this kind of meeting. It basically summarizes the experimental situation last week, points out the shortcomings in the experiment to the point, or arranges the next experimental schedule.
There are 16 people in the entire laboratory, and including them as interns, there are 19 people.
Academician Ma is the general person in charge, followed by Professor Chang.
Xu Qingzhou is no stranger to the various professional terms spoken by Academician Ma and Professor Chang.
He has presided over the development of several quantum satellites, and is not very familiar with orbital parameters, quantum states, etc.
Of course there are differences. For example, the quantum satellite development technology at that time was relatively mature, and the satellites launched were basically medium and high orbit satellites.
However, everything remains unchanged.
We are now in the stage of expanding our territory.
Low-orbit satellites, the difficulty of alignment and tracking between satellites and ground has skyrocketed, and they also receive very little quantum information.
The group that Xu Qingzhou belongs to mainly provides computing power support. There are 5 people. In addition to Professor Zhong Yongtao, there are also 2 Ph.D.s, plus 2 Xu Qingzhou and Deng Ziyi.
The current work content is responsible for designing mathematical models and algorithms for quantum states and entangled states.
This model will be merged with the previously completed attitude control model, free space loss model, etc. to form a complete model system.
The work meeting was over and everyone quickly got back to work.
The task of Professor Zhong’s group during this period is to create a mathematical model of quantum states.
Quantum states are usually represented in quantum mechanics as a linear combination of complex vectors, which exist in an abstract mathematical space called Hilbert space.
Professor Zhong led Xu Qingzhou and Deng Ziyi to be responsible for the complex vector representation in the model, and the other two people were responsible for the design of the density matrix representation.
Next to the computing classroom.
“The mathematical model of quantum states allows the state vector to be expressed as a linear combination of basis vectors. Ours will be more complex. Based on this, we will build a more efficient and advanced model.” Professor Zhong told Xu Qingzhou and Deng Ziyi said:
“This is the basic framework I built last night. c1, c2,..., cn are complex coefficients, indicating the weight of each ground state in the total state. The square modulus of these coefficients (|c_i |^2) represents the probability that the corresponding ground state is measured."
Xu Qingzhou was thinking in his mind that Professor Zhong’s basic direction is right, that is, some places can be optimized, such as the second Part of the third small point can increase the dimension of Hilbert space and expand it from the traditional three-dimensional Hilbert space to the four-dimensional Hilbert space of multiple qubits.
Professor Zhong talked so much that Deng Ziyi next to her could not keep up. While trying her best to remember, she looked at Xu Qingzhou next to her and saw that his eyes were blank, which was very different from hers. , and felt relieved.
Huh~
It would be nice if this Junior Brother Xu is just like me.
Although he is very good at mathematics and has published two SCI papers in the field of physics, it is not easy to quickly keep up with such large-scale experiments.
Professor Zhong and the others think too fast.
Although she has been here for a month, she has just adapted to the busy life here. The feeling is like a level 1 brave who has just entered the novice village and is being pulled by her teammates to fight a level 20 boss.
It’s too difficult.
It’s not terrible that you can’t keep up. What’s terrible is that you can’t keep up alone.
At the other end, Professor Zhong was writing down formulas on the blackboard while talking.
“[|\psi\rangle=c_1|\psi_1\rangle+c_2|\psi_2\rangle+\cdots+c_n|\psi_n\rangle”
In fact, he was very interested in these two Internships don’t have very high requirements.
A big experiment will be carried out in December, and now in May, it seems that there are still six or seven months in between, but there are too many things to do. In addition to the model, a large number of receiving tests also need to be continued.
Time is very tight.
It would be better to have multiple people help with the chores and organize the data.
Moreover, this classmate Xu Qingzhou can be said to be an "expert" in mathematics, specializing in the field of prime numbers, but he seems to be not weak in linear algebra and function analysis.
Once he gets used to it, he will definitely be able to play a lot of roles.
"Okay, this is the general framework. Xiao Xu, you are responsible for calculating the value of the diagonal Hamiltonian H. Xiao Deng, you sort out the data files over there and divide them into categories as before. ”
Professor Zhong assigned tasks to the two.
"Oh, okay."
Deng Ziyi has no objection. This junior brother is definitely better than her in mathematics, and she should do odd jobs.
However, seeing Xu Qingzhou still in a daze, she shook her head secretly, thinking that this junior brother’s acting skills were not good either. The professor had finished talking and was still pretending. Just when she wanted to pull his sleeves, Xu Qingzhou heard Said:
"Professor Zhong, I have some new ideas."
Professor Zhong was stunned for a moment: "You said."
"This part, we can give The Hamiltonian H and initial state ψ(0) of a quantum system are then used to solve the Schrödinger equation using the matrix exponential method of the numerical method time evolution operator to obtain the quantum state ψ(t) at any time t.”
Xu Qingzhou circled part of the content on the blackboard and wrote another formula next to it:
【i\hbar\frac{\partial\psi(t)}{\partialt}=H\psi(t)itψ(t)=Hψ(t)】
Professor Zhong looked at the blackboard, lost in thought , Preliminarily, the method and steps used by Xu Qingzhou seem to be more efficient than what he just said.
Deng Ziyi was stunned, her expression was confused, and she only had one thought in her mind: Who am I and where am I?
What the hell is this?
What kind of hero can defeat level 20 monsters at the beginning!
(End of this chapter)