Perhaps knowing that his request was a bit embarrassing, Director Li's voice became smaller and smaller as soon as he said this.

However, turning down the volume didn't make this embarrassing request sound more tactful, so he ended up getting a roll of the eye on Lu Zhou.

"What I just said is to tell you what the key to solving the problem is, not for you to continue to ask me how to solve the problem!"

However, in the face of Lu Zhou's complaints, Director Li not only did not have any intention of introspection, but continued cheekily.

"This ...... Anyway, you've found the problem, can't you just solve it? ”

Looking at the embarrassed smile on Director Li's face, Lu Zhou couldn't help but have an illusion.

Is this guy taking himself for a Tinker Bell?

No, it's probably not an illusion.

That's how it is......

……

With the sentence "I will ponder and ponder when I have time", he finally sent Director Li away, and when he saw Lu Zhou, who was almost at a certain time, he called Wang Peng, and then went straight to the parking lot.

Sitting on a black car, watching Wang Peng drive the car onto the highway with the steering wheel, Lu Zhou, who was sitting in the back seat, suddenly spoke.

"Wang Peng."

"What's the matter?"

Lu Zhou thought for a while and spoke.

"What do you think science is?"

For Lu Zhou occasionally asking himself some strange questions, Wang Peng is also used to it.

After thinking seriously for a while, he spoke.

"I think it's the way to solve the problem, something like that—"

"It's like letting water burn, letting air solidify, and letting steel fly...... Is that what it means? ”

Wang Peng thought about it, although he felt that this statement was a bit abstract, but he felt that there was nothing wrong with it, so he nodded.

"Pretty much."

Hearing this expected answer, Lu Zhou sighed softly.

"So, that's the biggest misconception of science."

Wang Peng: "......? ”

Lu Zhou: "Let's go to the Jinling Institute for Advanced Study." ”

Wang Peng looked at the car's endoscope and asked.

"Doesn't it matter if it's a meeting at three o'clock?"

"I'll give Xue-Chen Yushan a call in a while," Lu Zhou thought for a while and said, "It's the same if she goes." ”

……

Due to the interaction between the quantum communication system and the channel, the coherence attenuation of the pure state in the system will be caused, so that the randomness of the internal phase difference of each superposition component will increase, resulting in the failure of quantum information transmission.

A friendly solution is to add a repeater at intervals as in traditional means of communication, so that the attenuated signal can be amplified and continued to be transmitted.

While this method may sound easy, it is difficult for quantum communication to be possible. Because quantum communication is mainly based on the quantum effect of single-photon spin states, amplifying optics destroys qubits.

At present, there are two types of relay technology, one is trusted relay and the other is quantum relay.

The former is similar to key relay, where keys are passed between workstations that can be trusted. Compared to the latter, the technical difficulty is slightly lower, but the problem is that once the relay station is controlled by a hostile force, there is a possibility of eavesdropping.

In other words, if you adopt this technical route, unconditional security is based on the premise of "workstation trustworthiness".

The latter is based on quantum entanglement distribution technology, which establishes shared entanglement pairs between adjacent sites, stores the entangled pairs with quantum storage technology, and applies entanglement conversion operations to achieve shared entanglement between neighboring sites.

In terms of security, the latter is naturally incomparable, but the price is that the technical difficulty is quite large, so big that there are no friends, and the academic community gave up for a while around 07.

Objectively speaking, if it is only communication within the country, for example, as a military line, the use of trusted relay is completely sufficient. Just like the "Beijing-Shanghai Main Line" and the Mozi, under the protection of the people's army, there can be no situation in which the workstation is "occupied".

However, when the communication range is expanded to a global scale, the security of overseas sites cannot be 100% credible, and the security of trusted relays is up for debate.

In the current era of information globalization, it is impossible for any country to be separated from the big collective of the Internet, and what Director Li expects is obviously not the kind of technology that can only be played by himself behind closed doors.

Therefore, the key to the problem is how to solve the bottleneck of quantum repeaters.

When she came to the Jinling Institute for Advanced Study, Lu Zhou made a phone call with Chen Yushan, entrusted her with the afternoon meeting, edited an email, and sent the meeting outline to her mailbox.

The main discussion of the meeting was the work arrangement of the Lunar Mass Accelerator project, which he did not necessarily have to do in person if he had already arranged the work in advance.

In contrast, there are more important things waiting for him to do.

Coming to the underground research institute, Lu Zhou walked to the laboratory where he was researching carbon-based quantum processor chips some time ago, looked at the carbon-based integrated circuit board encapsulated in a transparent container, and said to himself.

"I was going to study this subject after I got the Earth and Moon Control Project."

"Well, let's try it first."

As he spoke, Lu Zhou motioned for Xiao Ai to evacuate the inert gas in the transparent container, and lifted the combination lock, putting on special gloves to take out the well-preserved carbon-based integrated circuit board from it.

The difficulty of quantum repeaters can be divided into three parts, entanglement exchange, entanglement purification, and quantum storage.

The first two are okay, and as for the last one, it is basically a problem in the same dimension as a quantum computer.

Interestingly, however, there is some overlap between the research on quantum memory and quantum computers. The only difference is that quantum memory is almost essential for long-distance quantum communication, but it is not a rigid requirement for quantum computers.

If there is, you can build more advanced quantum computers, and if you don't, there are less advanced quantum computers to choose from...... That is, the one he DIY himself.

In fact, more than eighty percent of the reason why Lu Zhou has not studied the technology of quantum memory for the time being is precisely because of this layer of factors.

In his original idea, with quantum computer technology breaking through and being widely used in the commercial sector, capital would naturally push quantum memory technology forward in the quest to build quantum computers that are faster and more powerful.

At that time, he didn't need to spend too much effort, and he didn't need to waste valuable points at all, and he would naturally get the quantum memory technology he expected.

"Quantum entanglement between a system stored in memory and any remote system not in memory must be maintained throughout the storage time ......"

"If this entanglement is broken at any time, such as if it collapses as a result of an observation, then the device can no longer function as a quantum memory and instead degenerates into an 'entangled interrupted channel' that can only transmit classical information."

"It's a little tricky......"

Looking at the integrated circuit board lying on the experimental equipment, Lu Zhou pondered for a long time.

It wasn't until the minute hand had crossed a large square that he suddenly thought of something and spoke.

"It's not something that can be done by one person."

"But ......"

"I don't think I'm an ordinary person."

Xiao Ai: [(??????) 】

Muttering to himself, Lu Zhou, who was sitting at the experimental table, suddenly picked up a ballpoint pen and wrote a line on the scratch paper.

【Three-dimensional quantum memory】

Looking at the seven neat big characters on the paper, Lu Zhou nodded with satisfaction.

"Let's call it that name for now!"