But no matter what, it is still much easier than quantum repeaters.
Academician Xue was silent for a while, then sighed softly and said.
Without disturbing his thoughts, Lu Zhou picked up the coffee cup, blew in the white mist, and took a slow sip.
"Those are all things of the past. I have basically switched to the direction of communications security since 10 years ago. I'm afraid it will be difficult to help you."
"Before you came here, I had already sent an email to communicate with the professors at HKUST, and after hearing my problem, they recommended you to me."
It must be admitted that this is not an easy task.
In this way, time passed day by day, and finally it was the last day of April.
"What's more, what has withdrawn from the stage of history is only the use of encryption algorithms in long-distance communications. In short-distance communications from base stations to individuals, as well as in other fields, cryptography can still play a significant role..."
After coming out of the laboratory, Lu Zhou motioned to Academician Xue to wait a moment, then looked at the two security personnel standing at the door and gave instructions in a serious tone.
Lu Zhou: "I have a good relationship with the group leader who was discharged from the army and changed jobs, so I helped arrange work."
"Before coming here, I did have a lot of confusion, but now... I feel like I have got the answer. What's more... "
"I guess you have a lot to ask, so please go ahead."
To put it simply, communication channels based on quantum communication technology are no problem for data exchange between a limited number of enterprises, but they are simply unable to carry communications on the scale of the Internet.
There are many things that even if he doesn't say anything, others will guess everything with just one look.
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 measured in Tbps.
Although it is easy to keep his mouth shut, the industry circle he is engaged in is really too small.
"But I believe that experience will never go out of date," Lu Zhou said seriously, "especially when we need to re-establish this communication network."
An experimental quantum communication pipeline with a length of about 500 meters was built in a hidden corner of the Jinling Institute for Advanced Study. At the same time, this ivory tower standing at the top of Chinese academia also welcomed a special guest...
In order to achieve the separation of keys and encrypted information, a new communication protocol is required. Not only that, in order to improve the efficiency of information transmission, the quantum communication network used to distribute keys must be rigorously designed.
The two security guards stood at attention and neatly raised their hands in a military salute.
"Are they from the army?"
Academician Xue: "Which aspect?"
Lu Zhou shook his head.
"This was not my plan."
The abstract description is that big hands deliver packages and small hands deliver keys.
According to the IST FP5 report, a 128-bit key can ensure the security of 100Gbit data. Theoretically, only one quantum communication channel with a bandwidth of Mtps is enough to lock all information across the Pacific.
After about five minutes, Academician Xue finally raised his head and spoke seriously.
Looking at Academician Xue, Lu Zhou continued, "In addition to cryptography, you are also an expert in the field of communications engineering. You once served as a senior engineer at China Electronics 46, and participated in the construction of early domestic optical fiber networks."
After chewing Lu Zhou's words repeatedly, Academician Xue fell into deep thought.
After bringing Academician Xue to the office, Lu Zhou asked his secretary to pour him a cup of tea and poured himself a cup of coffee.
"...Cryptozoology can already withdraw from the stage of history."
Data of this scale is not difficult for traditional optical fibers. However, for quantum communication technology that relies on entangled pairs of single photons to achieve information transmission, this is a problem that cannot be solved in the short term.
“… and all that is needed is to make some adjustments.”
The moment he heard these words, Academician Xue was shocked and looked at Lu Zhou in disbelief.
"I have a few questions and need to consult experts in related fields."
Without any hesitation, Academician Xue accepted Lu Zhou's invitation on the spot, participated in the project of building a quantum communication network, and stayed at Jinling University in the name of visiting and exchange.
"Is there anything I can do to help?"
After a pause, Lu Zhou looked at Academician Xue and continued.
Therefore, a perfect solution is to combine traditional communication methods with quantum communication technology, use traditional communication channels to send "locked" information, and then use quantum communication channels to distribute "unlocked" keys.
A smile of approval appeared on Lu Zhou's face.
Once the problem of quantum repeaters is solved, the entire quantum communication technology will have the possibility of commercialization.
However, quantum communication technology has a fatal shortcoming, which is the amount of data transmitted per unit time.
After leaving the Semiconductor Research Institute, Academician Xue looked at Lu Zhou who was walking beside him and asked.
However, this is not without solutions.
After watching the door close, Lu Zhou continued to look at the old man sitting opposite him, smiled and said.
Hearing these nostalgic things, a few memories came to Academician Xue's eyes.
"Besides, I never said it was only domestic."
From the establishment of the Jinling Institute for Advanced Study to the present, not even a scrap of draft paper has been lost, let alone criminal cases such as material theft, thanks to these lovely people who are dedicated to their duties.
It just so happened that he was still worrying about how to avoid his colleagues and old friends who were waiting for him to go to the Ministry of Industry and Information Technology to "ask for an explanation."
"Adjust the confidentiality level here to Class A. No one is allowed to come near this place unless it is me."
"This statement is too absolute. The upgrading of any technology takes time. Even with clean and efficient energy such as fusion energy, coal power still occupies a small part of the market share in our western region... "
Whether it's for the overall situation or for himself, leaving for a while is the best choice...
For those who came out of the army, at least he didn't have to worry about the political review. Commander Dai would not recommend anyone who failed the political review to him. Moreover, in terms of security capabilities, people who come out of the army are much better than those recruited through ordinary channels. Even basic training can be omitted and they can go to work directly.
"yes."
Hearing these words, Academician Xue was stunned for a moment, and said with a slightly embarrassed expression: "Quantum communication... I am not an expert in this field. You should find a professor from the University of Science and Technology... "
With the addition of Academician Xue, the entire quantum communication network project is advancing at a rapid pace. Relying on the experience of this old man, Lu Zhou quickly found the optimal method to combine quantum communication technology with traditional communication technology, and completed a structural framework for this new communication protocol.
This encryption method, which is similar to "one-time pad", can theoretically achieve "unconditional security". If there is only one unique key to unlock the door, no matter how fast the computer is, it will be impossible to steal the key through pure computing power.
But in the end, he shook his head.
The old academician's smile had a slightly complicated feeling.
"On Quantum Communication."
"You mean, you plan to... you plan to use that kind of... quantum optical fiber? Rebuild the domestic communication network?"
Looking at Academician Xue, whose voice had begun to speak incoherently, Lu Zhou smiled lightly and continued in a joking tone.
"certainly."
…
After doing these things, the secretary wisely left the office and closed the door behind him.