94: From Technological Warfare to Space Empire

Chapter 120: Equipment Dropped! Magnetic-Optical Trap Acquired!

Lin Yu nodded.

"Therefore, BEC would be the best starting point for quantum computing."

"All the atoms in the BEC are in the same quantum state, and their speed of motion is almost zero."

"No collisions between them—isn't that the ideal initial state?"

"Starting from BEC, lasers or microwaves can be used to precisely transfer a portion of atoms to another quantum state, creating an entangled state."

"Moreover, because the initial state is so clean, the resulting qubits have particularly good coherence."

Lin Yu spoke faster and faster, and the chalk scribbled a series of formulas and diagrams on the blackboard.

The audience below the stage frantically took notes.

They felt that their hand speed couldn't match that of Teacher Lin Yu, who was writing on the blackboard.

By now, they have genuinely come to believe that this young man is someone who can be their teacher.

The only downside is that it's too advanced for them to learn.

Could Teacher Lin come for two more days?

Just hand all of this over to them at once!

This isn't a class for ordinary students like them.

Chun Chun was giving lectures to those professors.

"For example."

"By using stimulated Raman spectroscopy, we can induce two-mode entanglement of atoms in the BEC."

"The wave function of this two modes would look like this—"

Lin Yu drew a diagram on the blackboard, showing two wave packets rising and falling, intertwined.

The audience below the stage were captivated by the beautiful curves; this was the beauty of mathematics.

"This is the simplest pair of qubits, and because of the macroscopic properties of BEC, this entanglement can be amplified to a macroscopic scale."

"And that's why we have to do BEC."

"As long as the quantum properties of a single atom can be manifested in macroscopic objects—"

The venue was so quiet you could hear someone breathing.

They all understood what this meant.

This means that macroscopic objects can be thoroughly tested using microscopic quantum formulas.

Why do so many people's understanding of quantum mechanics only go beyond the words themselves?

It's simply because quantum mechanics is too far removed from human understanding.

If it can only be used on a microscopic scale, then what's the point of this thing?

Macroscopic quantum products simply do not exist in the world.

If we only focus on academic research, then quantum mechanics will never reach the general public.

But if—but if—

The middle-aged scholar who had asked the question earlier paused for several seconds, muttering to himself.

"Macroscopic quantum entanglement—Macroscopic quantum entanglement—"

With each reading, his expression grew more and more agitated.

His eyes were filled with a fanatical light at the end.

"Comrade Lin, if this direction can be successfully implemented, that would be truly remarkable!"

"Humanity is about to leap directly into the interstellar age!"

That future is still quite far away. Lin Yu nodded.

Get ready to answer the next question.

It's possible that the relevant field of knowledge is not well-established in China at present.

So many questions were asked.

Lin Yu then answered seventeen or eighteen questions, ranging from experimental details to theoretical derivations.

From equipment parameters to material selection.

Fortunately, he had a lot of solid food in his stomach.

They were able to answer each one clearly and concisely.

Finally, it was Academician Wang who stood up and interrupted everyone's questions.

"Alright, alright, stop asking. If you keep asking, you won't get lunch."

He smiled and said to the people behind him.

"Xiao Lin has talked enough today, let him rest."

"If there are any problems, there will be other opportunities in the future."

After the Q&A session following the lecture had completely ended, everyone reluctantly began packing up.

But no one continued walking; they gathered in twos and threes, still discussing something.

As soon as the donkey left, he saw several elderly gentlemen in the first row stand up and walk towards him.

The leader was an elderly man with gray hair, wearing a blue Zhongshan suit, and he was in good spirits.

The old man reached out his hand, and Lin Yu quickly grasped it.

"Comrade Lin Yu!"

"I'm from the Physics Department, and my surname is Yang. Yang An."

Lin Yu greeted the old professor briefly, but what Professor Yang said next completely stunned him.

"The BEC you just mentioned is something our physics department is also working on."

Lin Yu's eyes widened.

"What?"

That's right, there will definitely be people doing it in China.

But a while ago, Academician Zhou's words made him think that China thought this thing was too time-consuming and might not even be able to develop it, so they gave up.

Professor Yang nodded with a wry smile, his tone full of helplessness.

"We've been working on this for three years. We assembled the laser cooling velocities ourselves, and we also designed the magneto-optical trap ourselves."

"The vacuum chamber was imported from Germany, which cost 80 yuan in foreign exchange."

"But we're stuck, we're getting nowhere!"

"The temperature just won't drop; it just won't reach the critical point."

"The maximum opening speed is only 50 micro-opens."

"We're still two orders of magnitude away from BEC."

Lin Yu was shocked to hear this.

50 micro-opening, that's already very close.

It's important to know that there are very few laboratories in the world that can perform BEC.

And they're all in the United States and Europe.

In Tsinghua University's physics department, a relatively unknown professor led a small team to build their own lasers, traps, and assemble their own equipment.

How did they manage to achieve a 50-micro-opening?

Before Lin Yu could speak, Professor Yang waved his hand.

"This is really nothing compared to you."

"We simply endured it all, we endured it for three years."

"We've lost over 300 million in foreign exchange."

The old professor was initially somewhat helpless and saddened.

But now, his eyes are shining.

"We've thought about evaporative cooling, which you just mentioned, but we haven't fully grasped it."

"I understood as soon as you said it; that's exactly what we're lacking right now."

"And there's the atomic selection method, the Zeeman effect—we were going in the wrong direction before."

"But now we truly have a new direction!"

"Comrade Lin Yu, I should thank you."

Lin Yu accepted the gratitude, but also acknowledged Professor Yang's persistence.

Professor Yang then took out a small notebook from his Zhongshan-style book, opened it, and handed it to Lin Yu.

Those are hand-drawn equipment drawings.

Dense lines, dense markings.

This was specially prepared by Professor Yang after he heard Academician Wang and Academician Zhou mention the concept Lin Yu had explained.

He is a leading figure in BEC research in China.

After the two academicians finished talking with Lin Yu that day, they went to find him.

I specially invited him to come and listen to Lin Yu's lecture today.

"This is a magneto-optical trap we designed ourselves. Please take a look and see if there are any problems."

Lin Yu took the notebook and began to read it carefully.

I stared at it for a full 10 minutes.

Lin Yu's own skill level may not be high enough.

But he has a cheat code.

Although the things I did a while ago didn't require cheats, they can now.

Lin Yu put this plan into his mind.

Inquire about the feasibility of the proposed solution.

[98%]

The coefficient of thermal expansion of the optical components is somewhat high; it is recommended to replace them with fused silica, which has a lower coefficient.

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