Paper and pen?

He... What is this intended to do?

After Yang Xiaoman heard Xu Mang's request, he looked at him with a confused expression, and while eating, he suddenly asked for paper and pen... Could it be that this big idiot is going to solve a scientific problem in a restaurant? Isn't it? A rare date.

Although Yang Xiaoman was very reluctant, she still took out a black pen and notepad from her satchel and handed them to Xu Mang.

"Huh?"

"What's wrong with you?" asked Yang Xiaoman.

"I thought about it... Coding methods that go beyond existing quantum error correction. Xu Mang said with a serious face: "Seeing your drawing action... Thinking of topology, maybe I can solve the one-millionth-fault tolerance of CSS code and Shure code based on the torus coding of the topology method. ”

Yang Xiaoman looked confused, what torus code, CSS code and Shure code... What the hell is it? I can't even understand it.

moment

Xu Mang began to write code on a notepad, which is different from traditional computer code, and is more inclined to code in a logical way, with only numbers and arrows on the notebook, and that's it.

Boom,

Yang Xiaoman saw Xu Mang frowning, frantically scribbling on his notebook, writing an Arabic numeral for a while, and then an arrow symbol, which was a little different from the traditional code.

What's he doing?

What exactly does he want to do?

He's crazy, isn't he?

"Ahem..."

"Husband?" Yang Xiaoman coughed lightly and asked cautiously, "We... What are we doing?"

"Huh?"

"Uh... Let's go on a date. Xu Mang replied absentmindedly, and then continued to frown and write a special code, seemingly... There's a bug here... It stands to reason that it can solve the problem of polygon nesting and neighborhood relations, but it looks so twisted!

Yang Xiaoman: (# ̄~ ̄#)

What to do?

I can't scold, I can't speak, I can't fight...

Is this romantic date... Have you spent time in silence and frowning?

"That..."

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

"Me?"

"I'm solving quantum error correction problems. Xu Mang said casually, thinking about why the torus code he wrote was so twisted.

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

After a long time,

Xu Mang seemed to be in despair, he... He found that his torus coding was useless, and in quantum error correction, the torus geometry was very weak, even less useful than CSS code and Shure code, and needed to fill in a lot of logical problems.

Often when a problem appears, it takes more than a dozen patches, and sometimes... After a patch, two errors appeared.

Finished!

It's all over!

This... What the hell is going on?

Xu Mang's eyes widened, and he looked at the characteristic code on the notepad with a confused expression, and couldn't help but turn a few pages forward... The huge frustration makes Xu Mang very uncomfortable, no wonder Google and IBM have always used physical bits, feelings... Only this one is most suitable.

Wrong!

There is no such thing as an absolute!

Xu Mang thinks that there is something wrong with his own structure, and the topological method is correct.

"Xiao Man... I..."

Xu Mang raised his head and saw Xiao Man dragging his head and looking drowsy, only then did he realize that there were very few customers in the Pizza Hut restaurant... Glancing at the time, it was almost half past nine.

Alas...

Accidentally,

Messed up on another date.

"Waiter?" Xu Mang shouted softly, "Pay the bill!"

...

August night,

It's very hot... The heat absorbed during the day continues to be released at night.

Xu Mang is walking home with the sleeping Xiaoman on his back, it is quite far from the Bund to home, about seven kilometers, according to the average speed of adults is 0.8 meters per second, then seven kilometers will take about an hour and a half.

"Brother?"

"Get in the car?" a taxi driver slowed down and shouted at Xu Mang, "Hit the meter!"

"Don't..."Xu Mang shook his head.

Watching the taxi leave, Xu Mang carried the light Xiaoman on his back and continued to walk home.

In fact

Xu Mang enjoys spending time with Xiaoman outside, because he can always find happiness inside, but unfortunately... I didn't cherish it before, but when the two of them were very busy, they found that such an opportunity was no longer available.

At this time, I remembered the vow I had made not to bring my work emotions into my home... Who knows unknowingly... This oath was torn apart by itself.

"Huh?"

"Stupid?"

"We... Where are we going?" Yang Xiaoman lay on Xu Mang's back, waking her up because of the bump, and asked sleepily, "I... How am I lying on your back?"

"You're so tired... I'll carry you home. Xu Mang said softly: "Sleep... When I get home, I call you. ”

"Oh..."

Maybe really tired,

Yang Xiaoman's head hadn't reacted yet, lying on Xu Mang's back, and falling asleep again... This time I slept more deeply than before.

There is still the last kilometer away from home, Xu Mang has reached the stage of exhaustion, and there is no way... Although Xiao Man is quite light, he is also a person, and this weight is directly pressed on his body, and he has walked six kilometers in a row, which is considered to be good physical strength.

"Tired or not?"

suddenly

When Xu Mang stood in place to rest, a voice came from behind him to Xu Mang's ears, and he was almost scared to pee.

"Huh?"

"Awake?" Xu asked in surprise, "I'll be home soon." ”

Yang Xiaoman didn't speak, quietly lay on Xu Mang's back, and asked gently, "Has the problem been solved?"

“...”

"Of course it's solved!" Xu Mang said with a smile: "Don't look at who I am?"

"Big idiot!"

Yang Xiaoman hugged Xu Mang's neck, leaned into his ear, and said, "You owe me a date... Remember to make it up to me next time. ”

"Oh..."

"Anyway, I'm going to take off, do you need to adjust your seat?" Xu Mang asked with a smile: "If you don't need it, then hold it tighter." ”

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

"Hey, hey, hey..."

The next second,

Xu Mang started the 100-meter sprint with Xiao Man on his back, and the sudden change scared Xiao Man to scream.

At this point,

On the streets,

There was one more couple who had just run out of the neurological hospital.

When I got home,

Xu Mang collapsed directly on the sofa, looking at the ceiling with a helpless expression... Overestimating his physical strength, I never thought of it... Seven kilometers can be so tiring.

"Stupid?"

"Take a shower, it's time to sleep. After Yang Xiaoman took a shower, he glanced at Xu Mang on the sofa, and said helplessly: "I usually let you not exercise." ”

Watching Xiao Man walk into the room, Xu Mang walked towards the bathroom, and after taking a shower... Xu Mang regained his previous spirit, he did not enter the bedroom for the first time, but sat on the sofa and took out a notepad and looked at the ring code he had written.

Structure...

What should I do if the topology is wrong?

Xu Mang entered into contemplation... What would happen if I changed the structure from geometry to plane?

This is the result of cranky thinking, Xu Mang doesn't know if he can succeed, in short, the inspiration that suddenly came out of nowhere, there is no scientific basis, but he still follows this plane code to consider the whole problem.

Not to mention,

When Xu Mang delved into this idea, he was surprised to find that flat coding seemed to be useful.

If the encoded form arranges the qubits in the form of a two-dimensional matrix, then only the nearest neighbor coupling between the bits is required, so that... The error rate requirement is 0.75 percent, which is much lower than one part per million.

Thinking of this,

Xu Mang began to encode the planar code, and at this time, the qubits on the notepad, like a chessboard, are arranged in a matrix, in addition to the traditional qubits used to store information, there are also auxiliary error correction qubits, which mainly detect bit flip errors and phase flip errors.

This encoding only requires nearest neighbor coupling.

"END..."

"Done?" Xu Mang looked at his coding results with an incredulous expression, no matter how he set it, this unintentional idea turned out to be a key to the world of quantum computing.

Pity...

The key is rusty.

"it!"

"Nima... Why is it like this again?!" Xu Mang looked at the paper on the tablet about Google, and realized how unreliable his flat code was, it needed a huge amount of qubits to form a logical bit.

According to Xu Mang's rough calculation, it is roughly about 4,000, and you must know that there are only more than 50 in the world at present, and this 4,000 qubits is a little too advanced.

Never mind!

That's it for now.

Xu Mang broke the jar and walked silently to the bedroom.

...

Following

The sun shone on the ass in the early morning, Xu Mang felt a burning sensation, and glanced at the time It was already noon, and Xiao Man had long since disappeared, and it was estimated that he was going to work.

After getting up and putting on clothes and pants, and then washing up briefly, Xu Mang came to the living room and found that there was a person in the kitchen, and when he walked in, he saw clearly that it was his mother-in-law.

"Got up?"

"Xiao Xu. Mother Yang said with a smile: "Yesterday with Xiaoman, I went home late?"

"Huh?"

"Oh... At... Eat out. Xu Mang said embarrassedly: "What... Mom, why didn't you go to work?"

"Your wife called me and asked me to come back and cook for you. Mother Yang smiled bitterly: "Alas... You see, I'm about to become a grandmother, and I actually... Forget it, as long as you and Xiaoman are happy, I don't care, right!"

Mother Yang looked at Xu Mang seriously and said seriously, "I heard that you haven't quit smoking yet?"

"Huh?"

"I... I'm usually under a lot of pressure at work, so... I won't be able to quit for a while. Xu Mang explained.

Mother Yang was silent for a moment, sighed and said, "After getting married, quit smoking, and wait for Xiaoman to have a child before smoking." ”

"Oh..."

"Understood. Xu Mang nodded.

After cooking for Xu Mang, Yang's mother went directly to the company, and at this time, Xu Mang was left alone in the huge family, as well as a problem that bothered him.

However, Xu Mang has given up, he plans to use physical bits to study quantum computers like Google and IBM. With the current science and technology, it is unlikely that the quantum error correction method can be completed, even if the theory and coding have been completed, the hardware cannot meet the requirements.

Thinking of this,

Xu Mang took out his mobile phone and made a call to the second grandfather.

"Hello?"

Xu Mang said with a smile: "Second grandfather... My dissertation is complete, absolutely unprecedented!"

Second Grandfather: ???

......