Chapter 242: Every time, there can be something new

In the living room, after finishing with Xu Qingzhou, Song Yao got up from the sofa, huffing. Her cheeks were even redder than before, her chest heaving rapidly, and her breathing was heavy.

Xu Qingzhou very tactfully handed her water: "You must be tired, drink some water."

Getting beaten up and still having to worry about whether she was thirsty—it was too hard.

Song Yao took the cup, thinking to herself that this guy at least had some sense. She drank the water in gulps, too lazy to bother with this lecherous guy. Seeing that the time was about right, she stepped into her slippers and went to the kitchen to cook.

"I'll come help."

Xu Qingzhou ran into the kitchen to help peel garlic. After peeling it, he leaned against the doorway and watched her cook.

Although he had received a sound beating and the flesh on his waist was throbbing with pain, he had already touched what he wanted to touch, so he was in a great mood.

A good start is half the battle; next, hehe... On Song Yao's pretty little face, her expression was cold, standing tall and graceful, exuding an aura of "strangers keep away." To be honest, no matter how you looked at it, the aloof School Beauty Song and the kitchen didn't quite match.

Xu Qingzhou swept his gaze around the conference room and finally walked over to sit next to He Dang.

Read! {

What kind of problem could there be?

Xu Qingzhou came to the research institute again. This time, he didn't go to classroom 4102 but went directly to the conference room on the 2nd floor. There were quite a few acquaintances here: Academician Ma Zailiang, Wang Yigui, and He Dang, an intern like himself.

Academician Ma didn't hold high expectations for the things Xu Qingzhou had mentioned earlier, such as quantum state implicit transmission, because he and Professor Pan were already top experts in this field.

Xu Qingzhou's method didn't require the use of controlled-NOT gates. As long as the initial noise was below a certain level, one could extract a smaller number of pure entangled pairs. By performing measurements on the same basis at both ends of these pure entangled pairs, one could obtain absolutely secure passwords.

Then, he heard Xu Qingzhou say: "However, I wrote a paper that contains my thoughts on quantum entanglement, including quantum secure communication with entangled photon pairs, quantum state implicit transmission, and the manipulation of entangled photon pairs."

"You, go stay in the living room." Song Yao pointed at Xu Qingzhou with a scallion, not wanting to see this annoying guy for the time being.

Xu Qingzhou had already vaguely become an indispensable part of the project.

On the side, watching even Dr. Wang ask Xu Qingzhou for help, He Dang sighed helplessly, feeling a bit envious. Being an intern as well, he could currently only do odd jobs.

The thin middle-aged man beside Academician Ma spoke with a smile; this was the project's chief engineer, Professor Pan Jianwei.

It was mainly because he had been influenced by Junior Sister Deng during this period, who said this Xu Xu Shidi was so heaven-defying that it put a lot of pressure on him, a first-year doctoral intern.

This result was exactly the same as Alice using Bell state measurement.

【p=|bb'l+|ba'l+\bb'l'+|ba'l=2|b'l】

【When |a'l≥lal≥lbl≥lb'|...】

A false alarm.

At this time, Wang Yigui also walked in. As soon as he sat down, he asked anxiously: "Is everything going smoothly on your side?"

!.

Xu Qingzhou shrugged, humming a little tune as he returned to his seat, intending to continue working on the quantum satellite paper.

"In addition, while studying quantum purification theory, I derived a highly efficient and precise method that should be helpful for our future experiments."

Next door, seeing Xu Qingzhou shake his head, He Dang let out a long breath in his heart; the sense of threat finally lessened a bit.

"Little Xu is here."

Entangled pair purification, also known as entanglement distillation, is the extraction of highly entangled quantum pairs from a set of partially entangled quantum pairs.

Professor Pan nodded slightly and plugged the USB drive into the computer. He was quite looking forward to the new ideas this young man had mentioned.

Hmph, in broad daylight, thinking about all sorts of strange things.

The Junior Sister was only a first-year graduate student; it was normal to be crushed.

"Professor Pan, Academician Ma." Xu Qingzhou greeted the two.

As for entangled pair purification, there was currently no effective method for this, and he certainly didn't believe Xu Qingzhou had made any substantial progress.

That was true. Although he had always heard that the Xu Xu Shidi was very capable, this plan had been discussed and written by two big shots, Professor Pan and Academician Ma.

Thinking about it carefully, it felt normal. Both Professor Pan and Academician Ma were world-class experts in the field of quantum communication.

After summarizing, there was naturally the work content for the next stage, mainly regarding model coupling and performance testing of entanglement sources. "Here, the wave function of the entire system can be expressed as the tensor product of the wave functions of these two subsystems."

As far as quantum communication is concerned, entanglement is the fundamental resource in quantum communication.

"Alright, that's the specific framework. Next, everyone can supplement the existing framework or put forward new viewpoints and opinions." No matter how the new ideas this little guy mentioned turned out, he had to be properly encouraged.

As he spoke, Xu Qingzhou handed the USB drive to Professor Pan.

Dr. Wang sighed in his heart, regretting having asked the Xu Xu Shidi just now. If he hadn't asked, the Xu Xu Shidi might not have brought out that paper to talk about at the meeting.

The faces of the others also held faint smiles. They relaxed and stared curiously at the projection in front. Talking about quantum entanglement in front of Professor Pan and Academician Ma... the young man was a bit arrogant.

Academician Ma and the others shook their heads; naturally, no one else had anything to add.

At 9 o'clock, the meeting began. This time, Professor Pan presided over it. Everyone reported their respective work progress, which was basically completed on time. For those who still had problems, discussions would be held afterward.

"I don't have any thoughts on this part of the work content." Xu Qingzhou shook his head. Frankly speaking, this performance test on quantum entanglement sources was written quite well.

Purification efficiency could theoretically be increased by 1.5 billion times.

During the time they had spent together, he had witnessed the awesomeness of this Xu Xu Shidi; every time, he could come up with something new.

"Okay, then let's study it after the meeting." Xu Qingzhou nodded with a smile.

It made it feel like showing off one's skills before Guan Yu.

He Dang: "."

It completely included key indicators such as degree of entanglement, stability, and transmission efficiency. Even looking at it from the perspective of more than a decade in the future, one couldn't pick out any flaws.

However, in the process of entanglement distribution, due to channel noise, the quality of entangled photon pairs shared over long distances would decline to a certain extent, thereby affecting the quality of quantum communication.

He was at least a first-year doctoral student now and had participated in quite a few experiments, big and small.

"Tsk tsk, as expected of the Xu Xu Shidi. I have a calculation that's stuck; the value I calculated doesn't look right no matter how I look at it. If you have time later, help me take a look."

Young people with drive still needed to be supported.

"Sit down first, the meeting will start in a moment." Professor Pan nodded. After saying that, he lowered his head and wrote equations on the draft paper in front of him.

But Xu Qingzhou had already cooked twice, and this time Song Yao insisted on doing it herself.

Especially Professor Pan—how could the person who could preside over the creation of the world's first quantum satellite be bad?

However, because the conference room was very quiet, the sound was exceptionally noticeable, and even the gazes of Professor Pan and the others fell on Xu Qingzhou.

Seeing Xu Qingzhou in deep thought, Wang Yigui asked in a low voice: "Xu Xu Shidi, what about you?"

"Good morning." Xu Qingzhou responded with a smile.

"I have one requirement: when everyone is performing numerical calculations, you need to choose stable algorithms and appropriate computational precision to avoid calculation instability caused by rounding errors, overflows, and other problems during the calculation process."

June 12th, early morning.

Regarding this problem, Xu Qingzhou had once found a very useful method during his second year of doctoral studies—the Xu Entangled Pair Purification Theory.

He Dang greeted Xu Qingzhou: "Good morning, Xu Xu Shidi."

He Dang constantly comforted himself psychologically.

【From the above analysis, it can be seen that the success probability of teleportation is determined by the smaller value of |b'| and |b|, which is to say, it is determined by the smaller of the generalized Bell basis used by Alice for measurement and the entanglement degree of the quantum channel.】

Professor Pan paused, looked at everyone, and said:

"Hoo~"

But in this period, the purification theory was not mature because in actual physical systems, environmental interference and noise often caused damage to the entangled state, making the purification process very difficult.

Moreover, the current quantum purification theory required the use of controlled-NOT gates, but precise and efficient controlled-NOT gates could not be realized with current technology.

"Smoothly." Xu Qingzhou said.

Because the computer was connected to the projector, the paper soon appeared in front of everyone.

【Quantum Entanglement and Quantum Operations】

【Abstract: This paper reviews the basic principles, methods, technical means, and applications of quantum communication, and introduces quantum state implicit transmission based on quantum entanglement, the manipulation of entangled photon pairs...】

【Keywords: Quantum Communication, Quantum Key Distribution, Quantum Teleportation, Manipulation of Entangled Photons】

(End of chapter) ===== CHAPTER 243 =====