It's reasonable for me to have a two-way foil for a second-level civilization, right?

Seeing that Lu Yongchang did not intend to interrupt his words, Academician Tang Wenshan continued.

"You must be aware of the current quantum communication technology."

"It does not contain the so-called long-distance entanglement effect."

"It just uses quantum entanglement distribution and teleportation to strictly encrypt information."

"At present, we don't have a theory that can use the quantum entanglement effect at a distance to transmit messages."

(ps. In reality, the quantum long-distance entanglement effect cannot be used to achieve long-distance communication, and the speed of information transmission is still limited by the speed of light.)

Lu Yongchang nodded.

He is naturally clear about this knowledge.

only……

"Academician Tang, the key difficulty restricting quantum communication technology, in my opinion, is nothing more than our inability to precisely control a single photon."

Tang Wenshan suddenly fell silent.

"So...it's true."

Tang Wenshan said with some hesitation: "If we can precisely control a single photon, then we only need to carry another photon in an entangled state, so that long-distance communication can naturally be realized."

Lu Yongchang shrugged: "Isn't this all right?"

"Our task now is simple."

"Precise manipulation of individual photons."

……

Three months later.

in the main laboratory.

A huge precision instrument sits in the middle of the lab.

This is the scientific research result of everyone in the past three months.

A single-photon control device.

Lu Yongchang and Tang Wenshan stood in front of the control device with apprehensive expressions, and looked at each other silently.

"Tang Lao, let's start the experiment."

Lu Yongchang took a deep breath and said in a deep voice.

This is the first step towards realizing quantum communication over distance.

Only by realizing the perfect control of a single photon, can they use the quantum entanglement effect to transmit information.

Hearing the order from Lu Yongchang, Mr. Tang had a complicated look in his eyes.

Excitement, apprehension and anticipation.

He slowly pressed a button in front of him.

The machine starts up.

The lights switch quickly.

The moment the indicator light turned green, a photon shot out from the single-photon emission device on the left side of the control device!

Photons travel through the tube at 30 kilometers per second.

In just an instant, the single photon passed through the long and narrow conduit and entered a closed black box on the right.

A large number of polarizers, half-wave plates and interferometers are installed inside the black box.

The inner wall of the black box is fitted with a highly reflective mirror.

The role of the mirror is very simple, to prevent photons from escaping, or in other words, being absorbed by this airtight black box.

Other devices are all for the precise control of photons.

"Single photon detected!"

After seeing some data appearing on the display screen in front of him, Lu Yongchang's eyes suddenly became excited.

"Zero, try to see if you can precisely control the state of this photon!"

The speed of the photon is too fast, and the state is too complicated. Therefore, if you want to control it, you can only rely on the strong artificial intelligence of zero.

"Yes, Professor."

Accompanied by Zero's sound, there was the slight hum of the machine running.

Looking at the complex data constantly flashing on the screen, Lu Yongchang clenched his fists lightly.

"Professor, it worked."

Zero's dull voice echoed in the main laboratory: "The instrument has successfully changed the motion state and spin state of this photon."

After a brief silence, there was loud applause in the main laboratory!

"Professor Lu! We succeeded!"

Tang Wenshan took a step forward, rushed to Lu Yongchang's side quickly, stretched out his hands to hold Lu Yongchang's hand tightly, the excitement in his eyes seemed to overflow!

"Yes!" Lu Yongchang breathed a sigh of relief, "We succeeded!"

Although there was a guarantee from the system, it was only at this moment that the boulder hanging in his heart completely fell to the ground.

"Tang Lao, next, we should prepare to study a pair of entangled photons."

Of course, before that, Lu Yongchang gave a group of scientific researchers a short leave.

After all, not everyone can sustain the high-intensity scientific research work for three consecutive months.

……

After returning to the office, Lu Yongchang sat on the office chair and closed his eyes again.

From the moment the experiment was successful just now, a bold idea popped up in his mind.

Now that they have mastered the precise control of a single photon, can the light quantum computer that was originally abandoned be useful again?

After all, the reason for abandoning optical quantum computers in the first place is that they cannot be programmed and can only solve specific problems.

The root cause of the inability to program is that humans cannot precisely control photons!

After thinking of this, a bolder idea vaguely rose in Lu Yongchang's heart.

With excitement, his consciousness entered the technology tree space.

as predicted!

The tech tree has quietly changed.

The brightness of the cursor of quantum ultra-distance communication technology has reached 50%!

And that's not the biggest change.

The biggest change was that a bright white solid line extended beside the cursor.

[Photon Control: Realize the precise control of a single photon! 】

The cursor is bright.

In Lu Yongchang's feeling, this cursor seems to be brighter than other cursors!

When Lu Yongchang focused on the photon control cursor, a dim dotted line extended from it.

The direction of extension is the "ceiling" that symbolizes a first-level civilization!

He subconsciously held his breath, silently watching the dotted line slowly extend in the fluorescent green space!

breakthrough!

The moment the dotted line broke through the ceiling of the first-level civilization, he only felt a bang in his mind!

His face was flushed, and he looked at the top of the technology tree system short of breath, trying to look up at the so-called second-level civilization technology!

The technology tree interface moves up slowly.

Several icons that were so dim that they were almost invisible appeared in front of him.

[Initial Mastery of Energy Weapons]

【Photonic Computer Technology】

【…】

The moment he saw those dim cursors, his heart rate rose rapidly!

really!

He guessed right!

The emergence of photon control technology means a breakthrough in the basic technology of photon computers!

However, the photonic computer, which originally seemed useless, has become the basic technology of the second-level civilization!

……

"professor?"

"professor?!"

A faint call came.

Lu Yongchang's eyes moved slightly, and he quickly manipulated his consciousness to withdraw from the technology tree system.

The moment consciousness returned to the body, a slight pushing sensation came from the shoulder.

He slowly opened his eyes.

Su Yutong pushed his shoulder anxiously.

"Professor Lu?" Seeing Lu Yongchang opened his eyes, Su Yutong breathed a sigh of relief, "You finally woke up."

"Just now I thought..."

Speaking of this, Su Yutong quickly stopped talking, and just looked at him with worried eyes: "Professor, are you okay?"

"Why don't you...go to see Dr. Wen again?"

Chapter 177 Signal Source: Proxima Centauri

Hearing Su Yutong's question, Lu Yongchang shook his head hastily.

Are you kidding me?

Then go to Dr. Wen?

Even if Lu Yongchang passed out again, he would not go to Doctor Wen for a physical examination!

"Then you just now..." Su Yutong's eyes became more and more worried, "Your reaction was the same as last time."

Lu Yongchang was taken aback for a moment, and then realized the meaning of Su Yutong's words.

It is estimated that the moment the technology tree broke through the limit of the first-level civilization, the "load" of his brain exceeded the standard again.

He waved his hand casually: "It's okay, there's no need to waste time checking."

"This time is different from last time, I know it well."

As he spoke, Lu Yongchang suddenly froze.

What Dr. Wen said to him more than three months ago flashed through his mind.

For the past three months, he basically stayed in the main laboratory and forgot about it for a while.

It seems... Dr. Wen said at the time that this girl Su Yutong sent herself there crying?

Thinking of this, Lu Yongchang frowned slightly, and a complex emotion rose in his heart.

He sighed softly and made a decision.

"Yu Tong, there is something I need to tell you."

Without giving Su Yutong time to react, Lu Yongchang continued directly, "I have noticed your hard work for such a long time."

"Your thoughts, I also know."

"It's just that human civilization is still in an extremely dangerous situation. If you are not careful, the entire civilization will fall into the abyss, and it will never be restored."