Paper and pen?

What is he going to do?

After hearing Xu Mang's request, Yang Xiaoman looks at him in a dazed way. He has a good meal and suddenly proposes to ask for paper and pen. Is this big fool going to solve scientific research problems in the restaurant? It can't be true? A rare date.

Although Yang Xiaoman is very reluctant, she still finds a black pen and notebook from her bag and hands it to Xu mang.

"Ah?"

"What's the matter with you?" Yang Xiaoman asked.

"I thought of... Coding beyond existing quantum error correction." Xu mang face seriously said: "see your drawing action... Think of topology, maybe I can based on topology torus coding, solve CSS code and Shure code one millionth fault tolerance."

Yang Xiaoman looks confused, what torus code, CSS code and Shure code... What are they? I can't understand.

After a moment,

Xu began to write code on the notebook. This kind of quantum error correction code is different from the traditional computer code. It is more inclined to the code of behavioral logic. In the notebook, there are only numbers and arrows, that's all.

Shua Shua, Shua Shua,

Yang Xiaoman saw Xu mang frowning and crazily doodling on his notebook. For a while, he wrote an Arabic number and then an arrow symbol, which was somewhat different from the traditional code.

What is he doing?

What on earth does he want to do?

Is he crazy?

"Cough..."

"husband?" Yang Xiaoman coughed gently and asked cautiously, "we... What are we doing?"

"Ah?"

"Er... Date." Xu mang answered absentmindedly, and then continued to frown and write special code. It seems that there is an error here... It can solve the problem of polygon nesting and neighborhood relationship, but it is easy to change!

Yang Xiaoman: (~ ~)

what to do?

Can't scold, say or fight...

is this romantic date going to be spent in silence and frown?

"So...

" what are you doing? " Yang Xiaoman asked softly.

"Me?"

"I'm working on quantum error correction." Xu mang said casually, thinking about why the torus code he wrote was so twisted.

Looking at Xu Mang's serious face, Yang Xiaoman also gave up the action of disintegrating him ideologically and ate durian pizza silently. However, the original sweet pizza was so bitter in the mouth. At this moment, Xiaoman was helpless, and she wanted to strangle Xu mang.

After a long time,

Xu mang seemed to be in despair. He... Found that his torus code was useless. In quantum error correction, the torus geometry structure was very weak, and even not as useful as CSS code and Shure code. He needed to fill in a lot of logic problems.

Often a problem, it is necessary to make a dozen patches, sometimes... After a patch, there will be two errors.

It's over!

The whole thing is over!

What about this... This special?

Xu mang opened his eyes and looked at the characteristic code on the memo pad. He couldn't help turning forward a few pages. The huge frustration made Xu mang very uncomfortable. No wonder Google and IBM always adopt the physical bit mode. Emotion... Is the most appropriate way.

No!

There is no such absolute thing!

Xu mang thinks that his own structure is wrong, and the topological method is correct.

"Xiaoman... I..."

Xu mang raised his head and saw that Xiaoman was dragging his head and was drowsy. At this time, he reflected that there were very few customers in the Pizza Hut restaurant. After a look at the time, it was almost 9:30.

Alas...

accidentally,

messed up another appointment.

"Waiter?" "Pay the bill!" Xu mang whispered

...

on August night,

it's very hot... The heat absorbed in the day continues to release at night.

Xu mang is walking home with a sleeping man on his back. It's about seven kilometers from the Bund to home. According to the average adult speed of 0.8 meters per second, it takes about an hour and a half to walk seven kilometers.

"Brother?"

"Get in the car?" A taxi driver slowed down and yelled to Xu: "make a watch!"

"No more..." Xu shook his head blankly.

Looking at the taxi leaving, Xu mang carries a light man on his back and continues to walk on his way home.

In fact,

Xu Mangting enjoys spending the two people's world with Xiaoman outside, because they can always find happiness in it. Unfortunately, they didn't cherish it before. As a result, when they were very busy, they found that such an opportunity was no longer available.At this time, I think of the oath that I once made, and I didn't bring my work mood into my home. Who knows, unconsciously, this oath has been torn up by myself.

"Well?"

"Idiot?"

"We... Where are we going?" Yang Xiaoman lies on Xu Mang's back. She wakes up because of the turbulence. He asks sleepily, "how can I lie on your back?"

"You're so tired... I'll carry you home." Xu mang softly said: "sleep... Home, I call you."

"Oh..."

maybe he is really tired,

Yang Xiaoman's head has not yet responded. He lies on Xu Mang's back and falls asleep again... This time, he sleeps more heavily than before.

The last kilometer away from home, Xu mang has reached the stage of exhaustion, there is no way... Although Xiaoman is very light, but at least he is also a person, this weight directly on the body, walked six kilometers in a row, which is good physical strength.

"Tired or not?"

All of a sudden,

when Xu mang was standing at the same place to rest, a voice came from behind his back to Xu Mang's ear, almost without fear of urination.

"Ah?"

"Awake?" "I'll be home soon," Xu asked

Yang Xiaoman did not speak, quietly lying on Xu Mang's back, gently asked: "has the problem been solved?"

"..."

"of course Xu mang said with a smile: "don't you see who I am?"

"Big idiot!"

Yang Xiaoman hugged Xu Mang's neck, leaned to his ear and said, "you owe me a date... Remember to supply me next time."

"Oh..."

"I'm going to take off. Do I need to adjust my seat?" Xu mang asked with a smile: "if you don't need it, hold it tightly."

"What are you going to do?" Yang Xiaoman asked curiously.

"Hey, hey..."

the next second,

Xu mang started the 100 meter sprint with Xiaoman on his back, and the sudden accident made Xiaoman cry out.

At this time,

in the street,

there was a couple who had just run out of the neurological hospital.

At home,

Xu mang collapsed directly on the sofa, looking at the ceiling with his face full of love. He overestimated his physical strength. He never thought that he would be so tired after a seven kilometer journey.

"Idiot?"

"Take a bath and get some sleep." After taking a bath, Yang Xiaoman took a look at Xu mang on the sofa and said helplessly: "usually you don't exercise."

Watching Xiaoman walk into the room, Xu mang walks slowly to the bathroom. After taking a bath, Xu mang recovers his former spirit. Instead of entering the bedroom for the first time, he sits on the sofa and takes out his notebook and looks at the ring code he has written.

Structure...

how to solve the wrong topology?

Xu mang enters into meditation... If he changes the structure from geometry to plane, what kind of change will happen?

It's a result of wishful thinking. Xu mang doesn't know whether he can succeed. In short, his inspiration suddenly comes out without any scientific basis, but he still thinks about the whole problem according to this plane code.

Not to mention,

when Xu went deep into this idea, he was surprised to find that planar coding seemed to be useful.

If the encoding form uses two-dimensional matrix to arrange qubits, then only the nearest neighbor coupling is needed. Thus, the error rate is required to be 0.75%, which is much lower than 1 / million.

Thinking of this,

Xu mang began to code the plane code. At this time, the quantum bits in the notebook are arranged in a matrix like a chessboard. In addition to the traditional quantum bits used for storing information, there are also quantum bits for auxiliary error correction, which mainly detect bit flip errors and phase reversal errors.

This coding method only needs neighbor coupling.

"Finished..."

"finished?" Xu mang looked at his coding results in an incredible way. No matter how you set them, this unintentional idea turned out to be a key to the world of quantum computing.

Unfortunately...

this key is rusty.

"Lying trough!"

"NIMA... Why is it like this again?" Looking at the paper on Google on the tablet computer, Xu mang realized how unreliable his plane code is. It needs a huge quantum bit to form a logical bit.

According to Xu Mang's rough calculation, it is about 4000. We should know that there are just over 50 qubits in the world. The 4000 qubits are a bit too advanced.

Forget it!

That's it for the time being.

Xu mang broke the jar and walked quietly to the bedroom.

...

the next day,In the morning, the sun shone on his butt, and Xu felt a burning sensation. After a look at it, it was already noon, but Xiaoman had already disappeared. It was estimated that he had gone to work.

After getting up and putting on his clothes and clothes, Xu mang went to the living room and found a man in the kitchen. Only when he walked in did he see clearly that it was his mother-in-law.

"Up?"

"Xiao Xu." Yang's mother said with a smile: "yesterday and Xiaoman together, quite late to go home?"

"Ah?"

"Oh... Eating out." Xu mang awkwardly said, "what... Mom, why didn't you go to work?"

"Your wife called me and asked me to come back and cook for you." Yang's mother said with a bitter smile: "ah... You see, I'm going to be a grandmother. I'll forget it. As long as you and Xiaoman are happy, I don't care, right!"

Yang's mother looked at Xu mang seriously and said seriously, "I hear you haven't quit smoking yet?"

"Ah?"

"I... I usually work under a lot of pressure, so... I can't quit for a while." Xu explained.

Yang's mother was silent for a moment and sighed: "give up smoking after marriage, and wait for Xiaoman to have a child before smoking."

"Oh..."

"got it." Xu mang nodded.

After finishing the meal for Xu Mang, Yang's mother went directly to the company. At this time, Xu mang was left alone in his huge home, as well as a problem that troubled him.

However, Xu mang has given up. He plans to use physical bit mode to study quantum computers, just like Google and IBM. His own quantum error correction method is unlikely to be completed with current science and technology. Even if he has completed the theory and coding, the hardware can not meet the requirements.

Thinking of this,

Xu mang took out his mobile phone and called his second grandfather.

"Hello?"

Xu mang said with a smile: "second grandfather... I have finished my thesis, absolutely unprecedented concept!"

Second grandfather:???

......

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