Chapter 107 Dean, do me a favor
Unlike ordinary light source structures, the light source structure used in quantum entangled light sources is very precise.
However, it is this precise light source structure that requires a lot of effort to design.
The core members of Wang Xiangwu's experimental group put a lot of energy into this.
And through these days of osmosis.
Xu You's progress is also very fast.
From the beginning, there was a complete blank in this knowledge.
Until you gradually begin to master it, and finally you can even come up with some good personal ideas.
Finally, after many days of hard work, the design of the new light source structure was completed.
With the support of Jinghua Feiqing Laboratory, the problem of micro-nano materials has been solved.
After completing the processing of the light source structure, a new phase of experiments officially began.
This time the experimental process was still not so smooth.
The first difficulty everyone encounters is the alignment problem between the cavity mode and the quantum dots.
Because the cavity mode split by the micropillars needs to be aligned with the exciton line and biexciton line of the quantum dots respectively.
This is a very difficult task in actual experimental operations.
Fortunately, after many experiments, we still got a small amount of ideal data.
"Under ideal conditions, the collection efficiency is much higher than before, and can reach up to about 12%."
After completing this phase of the experiment, the experimental group obtained new experimental data statistics.
Although compared with the previous experiment, this one is considered a relatively successful experiment.
But objectively speaking, such a result can only be described as mediocre.
Because the experimental operation process is very difficult, the photon collection efficiency is in a state of large fluctuation.
This approach has little practical significance.
All we can say is that it is a barely passable research result.
As the leader of this project, Wang Xiangwu would naturally not be satisfied with such a result.
"In this way, we can try other micro-nanostructure materials to see if we can achieve more ideal results."
After that, the experimental group also tried other micro-nanostructure materials such as nanowires and microlenses.
But unfortunately, no particularly ideal experimental phenomena were obtained.
Some other micro-nanostructure materials have improved their photon collection efficiency to a certain extent.
However, because they lack obvious cavity enhancement effects, the improvements in the entanglement fidelity and indistinguishability of photon pairs are very limited.
Moreover, the quality of the light source may be reduced due to the influence of surface defect charges.
All of these existing light source structures cannot meet the requirements of practical application in general.
After trying many times and still failing to achieve the desired result.
Wang Xiangwu had no choice but to decide to put this project aside for the time being.
"Anyway, our research has achieved some initial breakthroughs. Let's put this topic aside for now and continue researching other topics. If you have any good ideas for this topic, we'll consider restarting the project."
Although Wang Xiangwu attaches great importance to this project which is related to China's new generation of quantum computers.
But faced with the reality, Wang Xiangwu could only make the most rational choice.
After all, we cannot let all other projects in the laboratory come to a standstill just because of a project that has reached a bottleneck.
But Xu You did not feel discouraged by these.
Through these days of study and thinking.
Xu You's mastery of this knowledge has reached a very good level.
As for how to realize practical quantum entangled light source.
Xu You also had a lot of ideas.
However, so far, the number of various related knowledge chains in Xu You’s mind is still insufficient, and they cannot be connected together well.
Xu You felt that he should enrich his knowledge and read more papers to see if he could gain some important information and inspiration.
…
On this day, Xu You came to the library and wanted to borrow some related books.
After screening out many books with good content and some relevance to this topic.
However, Xu You realized an important problem.
My own library card can only borrow 6 books at a time.
Although Xu You could also choose to read these books directly in the library.
But Xu You always felt that reading in the library was far worse than reading in the dormitory.
If you want to enter the deep learning state, it is not as simple as turning on the system.
Instead, a transition process is needed.
Just like when a car starts, it cannot reach high speed all at once, but there is a starting process, and it has to accelerate little by little before reaching a higher speed.
Moreover, even in the same deep learning state, the efficiency is not exactly the same.
This is also the reason why Xu You prefers to study in the dormitory.
"No, I have to find a way to expand the borrowing limit of my library card."
Since he was not very familiar with the library administrator, Xu You felt that they might not help him, and they might not have such great power.
"Let's go find the instructor... No, let's go directly to the dean."
Xu You knew that if he wanted to find a counselor, he would probably have to apply step by step.
It would be better to just do it in one step and find a leader with more power.
This is the experience Xu You learned from Wang Xiangwu.
Of course, the prerequisite is that you must have sufficient strength and status.
Xu You felt that he was currently worthy of such conditions.
Arriving at the dean's office, Xu You knocked on the door.
"Come in!"
Fortunately, just like last time, Jiang Hong was also in the dean's office.
Xu You opened the door and said politely, "Hello, Dean."
Seeing that the person coming was Xu You, Jiang Hong immediately greeted him with a smile.
"Xu You, it's you. What's the matter this time? Don't be anxious, come in and sit down, and talk slowly."
After learning that Xu You had published another article in Nature.
Jiang Hong was also very glad about his previous choice.
Children like Xu You need personalized training.
If we should make the same standardized requirements as for other students.
Even if it cannot be said that it harmed Xu You, it would at least affect the speed of Xu You's progress.
"Dean, I would like to increase the borrowing limit of my library card. I can only borrow 6 books at a time, which is really not enough."
Hearing Xu You's request, Jiang Hong also laughed.
"I thought it was something else. This is easy. I'll just ask someone to upgrade your library card to a doctoral level. You can borrow ten books at a time. That should be enough."
However, Xu You was not satisfied with such improvement.
There is no essential difference between borrowing ten books at a time and borrowing six books at a time.
You know, Xu You prefers to use "stack" as the unit.
