Chapter 1191

After coming out of the laboratory, Lu Zhou beckoned academician Xue to wait for a moment, then looked at the two security personnel standing at the door, and said in a serious tone.

"The confidentiality level here is adjusted to class A. no one is allowed to get close to it unless it is me."

Two security guards stood upright and raised their hands cleanly for a military salute.

"Yes."

After leaving the semiconductor research institute, academician Xue looked at the boat beside him and asked.

"Are they from the army?"

Lu Zhou: "I have a good relationship with their leader, so I helped arrange the work."

For those who come out of the army, at least he should not worry about the political trial, and the head Dai, who fails in the political trial, will not recommend them to him. Moreover, in terms of security capability, the people who come out of the army are far better than those who are recruited by ordinary means. Even basic training can be omitted and they can go to work directly.

Since its establishment, the Jinling Institute of higher learning has never lost a draft paper, let alone a criminal case such as material theft. It relies on these dedicated and lovely people.

With Academician Xue in his office, Lu Zhou told his secretary to pour him a cup of tea and coffee.

After finishing these things, the secretary left the office wisely and conveniently took the door.

Looking at the door closed, Lu Zhou continued to look at the old man sitting opposite him and said with a smile.

"I guess you have a lot to ask. Please first."

Academician Xue was silent for a while and said with a slight sigh.

"Before I came here, I did have a lot of confusion, but now I feel like I've got the answer. What's more... "

The old academician's smile had a slight complex feeling.

“…… Cryptography, it's time to quit the stage of history

Lu Zhou shook his head.

"It's an absolute statement. It will take time for any technology to be updated. Even with such clean and efficient energy as fusion energy, coal power still occupies a small market share in our western region..."

"What's more, it's only the application of encryption algorithm in long-distance communication that exits the stage of history. In the short-distance communication from base station to individual, as well as other fields, cryptography can still play a significant role..."

After a pause, Lu Zhou looked at academician Xue and continued.

“…… What's needed is just to make some adjustments. "

As he chewed the words of Lu Zhou repeatedly, academician Xue fell into deep thought.

Without disturbing his thinking, Lu zhouduan took up his coffee cup, blew the curly white fog, and took a sip slowly.

After about five minutes, academician Xue finally raised his head and said seriously.

"Is there anything I can do to help?"

There was a smile of approval on Lu Zhou's face.

"Of course."

"I have a few questions that I need to consult with experts in related fields."

Academician Xue: "which way?"

"About quantum communication."

Hearing this, academician Xue was slightly stunned and said with a slightly embarrassed expression: "quantum communication I'm not an expert in this field. You should find a professor at HKUST... "

"Long before you came here, I had already sent an email to get through with the professor of HKUST, and after hearing my question, they recommended you to me."

Looking at academician Xue, Lu Zhou continued, "in addition to cryptography, you are also an expert in the field of communication engineering. You once worked as a senior engineer in 46 Institute of China Electronics and participated in the construction of early domestic optical fiber network."

Hearing these memorable things, academician Xue had several memories floating in his eyes.

But in the end, he shook his head.

"Those are old memories. I've basically turned to communication security since 10 years ago. I'm afraid it's hard to help you."

"But I believe that experience is not out of date," Lu said seriously, "especially when we need to re-establish this communication network."

At the moment of hearing this sentence, academician Xue was shocked and couldn't believe looking at the boat.

"You mean, you're going to You're going to use that Quantum fiber? Rebuild the domestic communication network? "

"This is not my plan."

Looking at academician Xue whose voice has already begun to be incoherent, Lu Zhou smiled lightly and continued in a joking tone.

"Besides, I didn't say it was just domestic."

……

Once the problem of quantum repeater is solved, the whole quantum communication technology has the possibility of commercialization.

However, quantum communication technology has a fatal disadvantage, which is the amount of data transmitted in unit time.

Take the submarine optical cable from the west coast of the United States to the east coast of China as an example. Its bandwidth is often in TBPs.This scale of data is not difficult for traditional optical fiber, but for the quantum communication technology which relies on single photon entanglement pair to achieve information transmission, it is a short-term problem that can not be solved.

In short, the communication channel based on quantum communication technology can satisfy the data exchange between limited enterprises, but it can not carry the communication of the scale of Internet at all.

However, this is not without a solution.

According to the report of ist FP5, a 128bit key can guarantee the security of 100Gbit data. In theory, only one quantum communication channel with a bandwidth of MTPs magnitude is needed to add a lock to all information across the Pacific Ocean.

Therefore, a perfect solution is to combine the traditional communication means and quantum communication technology, use the traditional communication channel to send "locked" information, and then use the quantum communication channel to distribute "unlocked" key.

In an abstract way, a parcel is delivered in large hands and a key is delivered in small hands.

This kind of encryption, which is similar to "one encryption at a time", can also reach the level of "unconditional security" in theory. If there is only one key to unlock, no matter how fast the computer is, it is impossible to steal the key through simple computing power.

In order to separate the key from the encrypted information, a new communication protocol is needed. Not only that, in order to improve the transmission efficiency of information, the quantum communication network used to distribute the key must be carefully designed.

It must be admitted that this is not an easy job.

But in any case, it's much easier than a quantum repeater.

With almost no hesitation, academician Xue accepted Lu Zhou's invitation on the spot, participated in the project of building quantum communication network, and stayed with Jinling University in the name of visiting and exchanging.

At the same time, he was worried about how to avoid those colleagues and old friends who were waiting for him to go to the Ministry of industry and information technology to "ask for a story".

Although it's easy to shut up, the industry he's engaged in is too small.

A lot of things even if he didn't say anything, a look others also guessed anything.

Whether it's for the overall situation or for himself, leaving for a period of time is the best choice

With the addition of academician Xue, the speed of the whole quantum communication network project can be described as "super speed". With the experience of this old man, Lu Zhou soon found the optimization method of the combination of quantum communication technology and traditional communication technology, and completed a structural framework for this new communication protocol.

In this way, the time passed day by day and finally arrived at the last day of April.

An experimental quantum communication pipeline, about 500 meters long, was built in a corner concealed by Jinling Institute of higher learning. At the same time, the ivory tower, which stands at the top of the academic circle in China, also welcomes a special guest