Scholar’s Advanced Technological System

It's time to do something, too.

In order for the Moon to take control of the last part of the task chain, there is a basket of things waiting for him to complete.

Yet just as he was about to get up from his desk, there was a sudden knock outside the office.

Thinking of yesterday's appointment on the phone, the ark probably guessed who it was, threw the paper towel into the packing box, then tied the plastic bag aside, cleared its voice and said.

“Come in. ”

The office door pushed open, only to see Director Li's familiar face appeared at the door without any surprise, saw the packing box placed next to the table, was about to greet him with a smile, his face couldn't help but show a surprise.

“… you eat this at noon? ”

The ark looked at him strangely.

“Different vegetables. Any questions? ”

“Uh, no...”

“No, let's just get down to business. I have a meeting at the Institute of Higher Studies at around 3: 00 p.m. about the work of the Moon Orbit Construction Committee." I looked at the time on the watch, and the ark looked at Director Li and continued, "What was it you said to me yesterday on the phone? ”

Director Li did not speak and looked at Wang Peng.

Wang Peng nodded. He picked up the packing box and exited the office. He closed the door with his hand.

There were only two people left in the office.

Seeing no one else, Director Li said.

“It's about that quantum encryption algorithm. ”

As soon as he heard about it, the ark's eyebrows suddenly lifted with interest and asked.

“Does it work? ”

“It works! This is just great.” Director Li shot him, haha smiled and said, “You don't know, after we saw it, the deputy director of the Institute of Information Engineering of the Chinese Academy of Sciences almost didn't knock his chin on the ground...”

There's always a bad feeling about the ark when you see this guy's eyebrow dancing.

Every time the old man and he are devoted to each other, he either intends to introduce him or has something to do with him.

“… if it works, why did you come to me? ”

Director Lee said hey hey smile.

“Didn't you say a while ago that after your carbon-based topology quantum processor chip came out, it wouldn't take long for the quantum computer to break through 1,000 quantum bits? ”

The ark thought for a while and nodded down.

“I wish I had. ”

“That's what this is about!” After filming his hand, Director Li continued, "We had a meeting in the ministry the other day dedicated to this issue, but we really lacked experts in this area, and we couldn't discuss it for half a day, so...”

“Stop, don't explain the consequences to me before,” Ark raised his hand, stopped Director Li's words, sighed and said, "… you can tell me what the trouble is. ”

“It's not a hassle, mainly to consult with you,” Director Li laughed with embarrassment and asked, “… when will this 2,000 quantum bit computer come out? ”

As soon as he heard Director Li, Ark immediately understood what he was thinking. Half a day was spent worrying about the timeliness of the technology.

However, it is also inevitable that this concern will generally arise for individuals.

If bottlenecks ranging from 80 to 500 are so easy to break, it's hard to say how long technical barriers can last from 500 to 1000, and from 1000 to 2000.

Replacing encryption algorithms is not a small thing to do with changing penguin passwords; it involves reform across the entire communications spectrum, where the hidden social costs that need to be paid are difficult to measure simply by money.

If possible, the relevant department would naturally like to replace the encryption algorithm once and manage it for a little longer.

Don't update the encryption algorithm once in 35 years. Even if China's financial, telecommunications and Internet industries are so resilient, they can't afford to be so tortured...

“Your fear doesn't make any sense," the index finger tapped gently on the table, and the ark thought for a moment, "but it's really hard to say. I can only tell you that 1,000 quantum bits of bottleneck can be broken in a short time, but 2,000 quantum bits… at least until 1,000 quantum bits are broken, I can give you an accurate estimate. ”

Director Li said, “Can't you even estimate? ”

“It's not a question of estimating whether it works or not, but it doesn't make any sense at all," the Ark sighed, “If you just want a psychological consolation, why don't you find a computational question, from the perspective of probability, it's all five or five open anyway. And..."

After a pause, the ark continued.

“Quantum encryption algorithms are always temporary, n quantum bits correspond to 2 ^ n states, not 2 times n. Theoretically, if it's just the difficulty of a linear pile of propositions, one day our encryption will fail to keep pace with the pace of development of our information technology. ”

There was silence in the office.

After repeatedly chewing on the ark, Director Li pondered for a long time and asked seriously after a while.

“What do you think we should do? ”

“The problem can only be solved fundamentally,” the Ark said after a while, "that is, to eliminate the possibility of leakage from the means of communication! ”

“You mean… quantum communication? ”

The ark nodded with praise.

“Exactly. ”

Director Li's expression was a little heavy.

“... but I hear quantum communication technology isn't easy, is it? Our country is still ahead of the curve, and there have been a lot of results, but I have never seen this technology move towards maturity. ”

“It's normal not to see this seedling,” the Ark said, "because now the breakthrough in this area is mainly focused on achieving photon entanglement and enhancing signal strength, but the key to truly achieving quantum communication is still on quantum repeaters. ”

Further down, quantum repeaters can also be subdivided into “quantum memory” and “quantum state write and read efficiency and storage time optimization” propositions.

And these two major technical dilemmas, which were mentioned in the DLCZ scheme, utilize the combination of quantum memory and single photon channels to suppress attenuation to achieve long-range quantum communication.

However, since there has been little significant progress in quantum memory, quantum communications can only be achieved within 100 kilometres and are extremely demanding for the transmission environment. And that lost the value of pragmatization, even once it was suspected that it was impossible to achieve.

“Quantum repeater? ”

“Well," looking at the thoughtful Director Li, the ark nodded down, "this piece is not a lack of progress, but a total lack of progress. This is the same all over the world...”

Quantum communication can be kept absolutely confidential because of the special properties of the wavefunctions, and once the photons that transmit the information are intercepted, any observation will lead to the collapse of entanglement.

It's commonplace to call between A and B if there's a third-party C standing in the middle of a wiretap. Whatever means C uses, bugs or ears on the wall, as soon as C hears a word, A and B will know that the communication is bugged, and the whole message will lose its meaning.

All encryption algorithms, including asymmetric encryption algorithms, are aimed at traditional means of communication. Encryption is simply superfluous in the face of quantum communication technology.

This is called “unconditional security”!

In about five minutes, Ark briefed Director Lee on the technical difficulties of quantum communication and its advantages over traditional means of communication.

Although it is something that is often spoken about by the elderly, Director Li has heard a lot of people say similar things before, but this time, after all, it comes from the mouth of Master Lu, and the instant meaning is different.

After listening to the explanation of the ark, his heart suddenly burst into heat and rushed to ask.

“Is this quantum communication of ‘unconditional security’ difficult? ”

The ark took its place seriously.

“To be honest, it's not just hard! It's quite difficult! ”

“Leaving aside the parts that I don't understand, you just need to know that this thing is basically already the most central bottleneck limiting the commercialization of quantum communication technologies. ”

The office is quiet again.

This time the quiet time was a little long.

The ark took a sip of the water cup on the table, moistened Runsangzi, prepared to comfort the old friend for a few words and told him not to rush. The encryption algorithm is perfectly ready to be used until 2,000 quantum bits of computers come out, and research on quantum repeaters has progressed.

The birth of any new technology will take time to precipitate. Although the quantum encryption algorithm he developed is not particularly smart for himself, it will be fine for a while.

However, just as he was about to ask, Director Li couldn't help but take a step forward, and the monkey asked in a hurry.

“... So, that quantum repeater, can you handle it? ”

Ark: “………………"