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For such a result, everyone is undoubtedly very disappointed.

Although originally everyone was not too disappointed with this new plan.

But even if the collection efficiency can be improved slightly, it can give them some incentives.

But the collection efficiency has not increased but decreased, which really made them feel very frustrated.

In the experimental group, the most disappointed person was undoubtedly Wang Xiangwu.

As the proposer of this plan, Wang Xiangwu knew that he must bear the main responsibility.

These days, Wang Xiangwu has been worrying about the failure of the experiment.

It can even cause insomnia at night, tossing and turning in bed.

But Wang Xiangwu also knew that at this time, one must not blame oneself too much.

Scientific research has never been smooth sailing, and it is very normal that ideal results have not been produced.

In the laboratory, Wang Xiangwu did not show too much loss, but encouraged everyone so that everyone could regain their confidence.

For this reason, Wang Xiangwu also deliberately let everyone rest for a day.

After everyone recovered physically and mentally, Wang Xiangwu organized a summary meeting on this new topic again.

"Unfortunately, the experimental results have proved that this plan failed. But it is also very normal. Originally, this is a completely unprecedented direction. We don't have much to learn from, and we can only continue to explore forward."

"Although the experiment failed, it was not completely fruitless. We must summarize the reasons for the failure and see whether to improve this plan or seek new ones."

After a day's rest, everyone's mental state has improved a lot, and they will not be as depressed as before.

"We have also summed up these days. The main reason is that quantum dots have a radiation pattern similar to dipoles, and the radiation directionality is very poor. At the same time, quantum dots are still in a semiconductor material with a high refractive index. Therefore, radiation and collection The efficiency of entangled photon pairs into the objective lens, into the fiber is very low."

The experimental data shows that the average collection efficiency of entangled photon pairs is even less than 1% in this stage of the experiment.

Such a low efficiency is far from reaching the goal of high efficiency among the "three highs" set by Wang Xiangwu.

Xu You also learned about the main problems in this plan through observations in the laboratory and analysis of experimental data.

It is a pity that even if the problem is known, it is far more difficult than imagined to improve the solution or propose a new solution.

In it, there is not only a lot of knowledge of quantum physics and optics, but also some knowledge of materials and device structures.

After all, Xu You is just a freshman, and a lot of knowledge is only dabbled in, far from being very professional.

At this time, another professor in the laboratory put forward a new point of view.

"I think that the solution of using micro-nano structure materials can be considered to extract the radiation photons of quantum dots. For example, micro-column pairs, if there are suitable materials and an ideal structure can be designed, it is entirely hopeful. Raise the collection efficiency to a higher level."

The professor's name is Wu Hong, and the experimental group is the professor with the highest rank and qualifications except Wang Xiangwu.

Listening to Wu Hong's proposal, Wang Xiangwu fell into deep thought.

The so-called micro-nano structure materials refer to fine structure materials including micron and nano-micron scale.

This structure is very precise, and the size is often tens or hundreds of nanometers.

Materials with such precise structures often contain many new optical properties.

These new optical laws cannot be reflected macroscopically.

But it is suitable for nanoscale directions such as quantum optics.

Xu You has also learned about this kind of micro-nano structure material from some materials, but it can only be said to be a preliminary understanding.

It is still not possible to apply it to the experiment.

"The micro-nano structure scheme is indeed feasible, but the problem is that we are not engaged in micro-nano materials, and even our School of Materials at Ji University may not be able to meet our ideal requirements."

"I know some elite material experts in this regard, and I will consult with them later to see if there are any suitable materials." Wu Hong said.

"Well, that's fine. Let's tentatively explore this direction first. If you have any plans, please feel free to contact me."

In fact, hearing the "material", Xu You also thought of his father Xu Zhou.

Xu You was still thinking just now, should he talk about this matter at the meeting.

But after thinking about it, I'd better ask Xu Zhou if he has done any research in this area, and if possible, talk to Wang Xiangwu about it.

At this time, Xu You also somewhat understood what Luo Wenkun said before, scientific research is also the truth of the world.

Just like Wu Hong knew Jinghua's material experts, this can be said to be a kind of network resource.

After all, when a scientific research project is large enough and involves a lot of things.

It is difficult to handle everything in a laboratory.

In this case, more experts from other industries are needed to cooperate together.

Even the fact that Xu You obtained some metal cluster materials through Xu Zhou can be said to be a kind of network.

After the meeting, everyone's condition is better than before.

Although I don't know how feasible it is, the subject finally has new hope.

Coming out of the laboratory, Xu You took out his mobile phone and sent a message to Xu Zhou.

"Professor Xu, have you ever made micro-nano structured materials?"

After a while, Xu Zhou replied to Xu You.

"Son, although your father and I are a master of materials science in China, there are many kinds of materials. My main research is metal materials. I have never done this kind of micro-nano structure materials, and I don't know much about them. .”

For this result, Xu You was also mentally prepared.

Xu You also knows that when scientific research goes higher, the direction of research often becomes more detailed.

For example, a student majoring in physics as an undergraduate, chooses the direction of condensed matter physics at the master's level.

After getting a Ph.D., he mainly studied the topic of superconductivity in condensed matter physics.

As long as this small direction can be used, some breakthrough research results can be made.

You can complete your Ph.D.

"Okay, I see, I will contact you if there is any problem."

Fortunately, Xu You didn't tell Wang Xiangwu before that his father was engaged in materials.

That being the case, Xu You felt that it would be better to wait for news from Professor Wu Hong first.

After Wu Hong contacted Jinghua's material experts, he also got some good news.

Jinghua's materials experts have indeed done a lot of research on micro-nano materials.