Vol 3 Chapter 123: , Quantum computer

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After arriving at a place, planting maple trees is a continuation of the tradition of Liuyun Town in the Qingquan era. A few brothers in the family planted a few maple trees, and the two brothers He Jingfeng naturally planted 2 maple trees.
But if you think these maple trees are traditional maple trees, this kind of maple tree is a new type of maple tree specially developed by a company inside the empire and researched and developed using genetic recombination technology.
Its characteristic is strong adaptability, as long as it is on the planet of life, it can almost reach 100% survival rate; it can grow very tall, luxuriant, and very good ornamental, this symbolic maple Trees, of course, cannot be thin and thin, and have small leaves.
And this kind of maple grows very fast. Although it can't be faster than those super fast-growing trees, it is more than ten times faster than the traditional maple. It only takes a few years to grow into a towering tree; In addition, this type of maple is genetically controlled. All the trees used to bring to the outer planet for planting have adopted fund birth control surgery, which cannot reproduce the next generation, in order to protect the ecological environment of the planet!
In the interstellar era, anything is not a simple thing. This maple, which integrates biotechnology, is called "heritage tree" in the empire.
After planting the inheritance tree, He Jingfeng was troubled. The population of the Canis galaxy is only tens of millions. When it is divided into each planet, the population is very scarce. The 20,000 acres of land in his family unexpectedly How to develop.
The land is vast and the population is scarce. Almost every household has a huge land. All of them are worrying. He Jingfeng is also the same. He drove the aircraft slowly over his territory and wanted to find something special.
"The land is a good land, and a fertile land is leveled. Unfortunately, I can't find any bright spots to develop! Now it seems that only some cash crops can be planted." He Jingfeng shook his head and worried.
...
The Milky Way, the Solar System, the empire capital Venus, Liu Qingquan woke up early from sleep, and the long-established biological clock was very punctual and woke up on time.
Look at the beauties in arms, because the throne was passed on to her son. Since this time, she has been eager to herself. She has unlocked countless poses that were unthinkable before, which Liu Qingquan couldn't bear.
"Well, it's a lot of leisure after passing this position, and I'm not used to it!" Liu Qingquan put his hands on his head and looked at the beautiful scenery outside. The sun was shining and the birds were fragrant. It was a good day!
"Zhou Jingbo seems to say that the quantum computer has made new progress. Well, go and see where he is today!" Liu Qingquan seemed to think of something and was about to get up quietly, crumbling to avoid disturbing the beauties around him.
"Why do you go early? You don't want to be active again?" Who knows that the beauties around her have already awakened and saw Liu Qingquan, who was crumbling, and held it, she said humorously.
"You're dead ~ demon ~ Jing, let you know how powerful I am today!" Liu Qingquan watched the beauty half-covered and graceful, ready to burst into thunder and let the other party feel some thunder and rain!
In the bright morning, the sounds of charming sounds of heaven sounded, evoking endless reveries!
At 9 o'clock in the morning, Liu Qingquan came to the Quantum Research Institute of the Imperial Academy of Sciences in a refreshing manner. The Quantum Research Institute, as the most important branch of the Imperial Academy of Sciences, covers a very large area with many research offices, large and small research institutes. There are more than a thousand laboratories and hundreds of thousands of scientific research staffs, large and small.
"Boss, you are here exactly. I have a problem here and I want to ask you."
Zhou Jingbo, who is concentrating on the experiment, accidentally saw Liu Qingquan come over and hurried over. Although the research work on quantum computing has reached the final stage, there are still some major topics that have not yet been overcome. Since this time, Zhou Jingbo has been sorrowful. Can't stop, as soon as I see Liu Qingquan coming, as if I see a savior, the fart is coming!
"Look at you, anyway, you're also old. How do you say that you are now a national treasure of the empire, pay attention to the image!" Liu Qingquan saw Zhou Jingbo's eagerness and said, shaking his head.
"Boss, aren't you unaware of my temperament, let's say what age I am, I'm stronger than a 20-year-old guy, killing a tiger is no problem!"
Zhou Jingbo's lip-skimming, practicing a special Yuanli method for scientists, and Zhou Jingbo has been practicing since he graduated from college and entered Qingquan Technology. He is still OK, so the progress has been good. Now he looks no different from decades ago. .
"Boss, our research work on quantum computers has reached its final step, but until now, there is still a very headache!"
Zhou Jingbo is a workaholic. Without talking to Liu Qingquan, he will directly enter the topic.
"Well, what's the problem to listen to?" Liu Qingquan nodded. Compared with those who like compliments, Liu Qingquan still likes Zhou Jingbo's fierce style. This is what a scientist should have!
"Whether it is quantum parallel computing or quantum simulation computing, quantum coherence is essentially used. Unfortunately, it is difficult for us to maintain quantum coherence in practical systems."
"In a quantum computer, qubits are not an isolated system. They interact with the external environment and cause the attenuation of quantum coherence, that is, decoherence (also called" decoherence "). Therefore, quantum computing must be made a reality One of the core issues is overcoming decoherence. "
Zhou Jingbo began to slowly explain the problems encountered in his work. If you need others to answer your questions, you need to slowly and clearly explain the causes and consequences of things. At this time, Zhou Jingbo is like this.
"In order to eliminate quantum decoherence, we have used countless methods. In the end, we found that quantum coding is the most effective method to overcome decoherence discovered so far."
"The main types of quantum coding schemes are: quantum error correction codes, quantum error avoidance codes, and quantum error prevention codes. Quantum error correction codes are an analogy of classic error correction codes, and they are the most commonly studied type of codes. Their advantages For a wide range of applications, but the disadvantage is that it is not efficient. "
When Zhou Jingbo descended here, he stopped a little and let Liu Qingquan absorb the things in front.
After listening to Zhou Jingbo's words, Liu Qingquan kept calculating the other party's thinking in his mind. Well-informed Liu Qingquan naturally knew what problems they encountered.
Quantum computers, as the name suggests, are machines that implement quantum computing. To clarify quantum computing, first look at classical computing. A classical computer can be physically described as a machine that transforms an input signal sequence according to a certain algorithm. The algorithm is implemented by the computer's internal logic circuit.
A classical computer has the following characteristics: its input state and output state are both classical signals, which are described in the language of quantum mechanics, that is, its input state and output state are both eigenstates of a certain mechanical quantity. For example, enter the binary sequence 0110110, and use a quantum notation, that is,
0110110>. All input states are orthogonal to each other. It is impossible to input the following superposition state for a classical computer: c1
0110110 ＞ + c2
1001001 ＞.
Each step of the transformation in a classical computer evolves into an orthogonal state, and the general quantum transformation does not have this property. Therefore, the transformation (or calculation) in the classical computer corresponds to only one type of special set.
Corresponding to the above two limitations of classical computers, quantum computers have been promoted separately. The input of a quantum computer is described by a quantum system with finite energy levels, such as a two-level system (called a qubit). The transformation of a quantum computer (ie, quantum computing) includes all possible positive transformations.
Therefore, the characteristics of a quantum computer are: the input state and output state of a quantum computer are general superposition states, which are usually not orthogonal to each other;
Transformations in quantum computers are all possible positive transformations. After the output state is obtained, the quantum computer measures the output state to give a calculation result.
It can be seen that quantum computing greatly expands classical computing, which is a special type of quantum computing. The most essential characteristics of quantum computing are quantum superposition and quantum coherence.
The transformation that a quantum computer implements for each superposition component is equivalent to a classic calculation. All these classic calculations are completed at the same time and are superimposed with a certain probability amplitude to give the output result of the quantum computer. This calculation is called quantum parallel computing.
Quantum computers have very obvious advantages over traditional computers. Quantum characteristics may break the limits of existing classical information systems in terms of increasing computing speed, ensuring information security, increasing information capacity, and improving detection accuracy.
A 250 qubit (consisting of 250 atoms) memory may store up to the 250th power of 2, which is more than the total number of atoms in the known universe.
A quantum search algorithm is used to attack the existing cryptographic system. Classical calculations require 1,000 years of computation, and quantum computers need less than 4 minutes.
The quantum key system uses quantum states as information carriers, and its security is guaranteed by the principles of quantum mechanics.
Based on the quantum teleportation process, multi-terminal distributed operations can be realized to form the quantum Internet.
...
"Are you worried about how to improve the efficiency of quantum coding?"
For quantum computers, Liu Qingquan has always been very concerned. Although quantum computers seem to be simpler than quantum bubble bombs, quantum communication seems to be simpler, but in fact, quantum computers are very powerful, but their calculations are better than quantum communication and quantum. Bubble bombs are many times more complicated.
The technology contained in the quantum computer itself includes quantum communication technology and quantum bubble technology, and also involves countless other related new quantum technologies. It is not that the calculation of quantum computers is simpler than ordinary people imagine!
ps: I recommend a fantasy novel with no lower limit. It writes that all fantasy characters suddenly come to the real world, including fantasy characters in novels, comics, movies, games, myths and legends, so the world becomes chaotic and various This is where the fantasy characters fight. This book is called "World Fantasy"! (To be continued.)