Xueba's technology tree

Chapter 228 Quantum Coherent Sphere

Zhou Yu walked into the quantum computer laboratory, and he knew that the prototype of the quantum computer had been developed.

The quantum computer prototype can realize various functions expected by the quantum computer, and the quantum computer project can be declared a success.

The quantum computer they developed is only 30 qubits.

This is only a barely usable quantum computer. In the future, the quantum computer laboratory will develop quantum computers with hundreds or even thousands of qubits.

Zhou Yu came to a dust-free laboratory covering an area of ​​500 square meters, a huge equipment lying in the center of the laboratory.

In the center is a huge sphere with a diameter of two meters. It is the most conspicuous, and many researchers surround it to look at the parameters. At first glance, it is the core equipment of a quantum computer.

On the upper left of the laboratory is a coiled pipe, which resembles a large mosquito coil placed on the ground.

On the right side of the laboratory is a row of cabinets with flashing lights, these cabinets occupy almost a quarter of the laboratory.

Zhou Yu walked directly to the side of the big ball, a young man about his age.

This young man kept a tight fit and was wearing a laboratory anti-static white coat, staring at the data displayed by the big ball.

This person is Zhang Wei, director of the Quantum Computer Laboratory, and Academician Pan's favorite student.

He contracted AIDS due to an accidental friendship, so he voluntarily resigned from the laboratory under the Chinese Academy of Sciences, and he got acquainted with the scientists when he came to the Xinghuo Science and Technology Research Center for treatment.

Zhang Wei was recruited to the quantum computer laboratory by Academician Tian Kai, and soon became the leader of the quantum computer laboratory by virtue of his ability.

Academician Tian Kai walked over and said, "Zhang Wei, please introduce the quantum computer to Mr. Zhou and me."

"Hello Mr. Zhou, Mr. Tian."

Zhang Wei pointed to the huge sphere beside him and introduced: "This device is the quantum coherent sphere at the core of a quantum computer."

The most essential features of quantum computing are quantum superposition and quantum coherence.

The transformation realized by the quantum computer for each superposition component is equivalent to a kind of classical calculation, and all these classical calculations are completed at the same time, which is the quantum parallel operation of the quantum computer.

Whether it is quantum parallel computing or quantum analog computing, it is essentially the use of quantum coherence.

Zhang Wei said proudly: "As we all know, quantum computers can realize their functions, relying on quantum coherence.

But quantum coherence is difficult to maintain in practical systems.

In a quantum computer, the qubit is not an isolated system, it will interact with the external environment, resulting in the attenuation of quantum coherence, that is, decoherence.

If we want to make quantum computing a reality, a core problem is to overcome decoherence.

This device is specially designed to overcome the quantum decoherence of quantum computers, allowing qubits to realize quantum parallel computing and quantum simulation computing. "

Zhou Yu smiled, he finally discovered what he knew.

"I know this, quantum coding is the most effective way to overcome decoherence found so far.

The main quantum coding schemes are quantum error-correcting codes, quantum error-avoiding codes and quantum error-proofing codes.

What kind of coding scheme do you use? Is this the coding scheme studied in cooperation with director Wei Tianpeng and others? "

Zhou Yu was a little surprised. Their secrecy is too good. In general projects, Zhou Yu only pays attention to the key progress.

But when it comes to the cooperation of multiple laboratories, as the director of the Science and Technology Committee of Xinghuo Technology, he is responsible for coordinating various laboratories, and he basically understands any cooperation.

Zhang Wei was stunned for a moment, and explained with a smile: "Mr. Zhou, we did not use quantum coding to solve the problem of decoherence.

This solution is completely a trap, which is an important reason why no real quantum computer has been developed yet.

The quantum coding scheme is only through coding, that is, a software scheme, to artificially compensate for the missing part of the qubit information.

Quantum mechanics states that the quantum moment is in the state of Schrödinger's cat, which cannot be observed at all, and the subjectivity is supplemented by coding, which completely destroys the quantum state.

The results calculated by this kind of quantum computer must be incomplete results, and the most important ability of the quantum computer cannot be perfectly utilized at all. "

Academician Tian Kai reminded: "Zhang Wei, what are you explaining! Directly explain how your coherent sphere works.

The basic operation of this quantum computer prototype is the information we want to know. "

Zhang Wei said with some confusion: "This is the first time I have been inspected by Mr. Zhou, and I am a little nervous.

This is also a habit I brought from the Chinese Academy of Sciences, and the leaders there like us to explain it this way.

The more esoteric it is, the more people don't understand. Therefore, they feel that this project has a future and will increase investment in this project. "

When Zhang Wei said this, he immediately eased the slightly awkward atmosphere at the scene.

He also briefly explained the principle of the operation of the quantum coherence sphere, which is actually very simple. The two most obvious forces in the microscopic field are the strong interaction force and the weak interaction force.

Quantum decoherence is because the external system affects the qubit, so he uses the strong interaction force and the weak interaction force to form a force balance system.

The qubits at the equilibrium point, which are affected by the outside world, cancel each other out, which is slightly equal to being unaffected.

This method is the most universal and efficient method at this stage.

It cannot completely offset the influence of the outside world on the qubit, but it can minimize this influence, so that the qubit can maximize coherence.

Zhang Wei said gratefully: "I would also like to thank Zhao Zhao, a scientist in the neutrino laboratory.

He inspired me by trapping neutrinos with the weak force through heavy particles.Only then can I develop a quantum coherent sphere. "

Zhou Yu clapped his hands and said excitedly: "It's easy for me to understand when you say that. Isn't it equivalent to the Lagrangian point of a celestial body, and the object at this point is in a state of gravitational balance."

There was a look of astonishment on Zhang Wei's face. The gap between celestial mechanics and quantum mechanics is too great. These two things are completely irrelevant.

"The principle is very different, but the effect is similar, that is, try to keep the qubit in balance with the external system."

Seeing Zhang Wei's helpless face, Zhou Yu knew that he had said something wrong just now.

He was about to continue to understand the situation of the quantum computer prototype, and suddenly thought that the quantum coherent sphere is the core equipment of the quantum computer.

As long as this technology is obtained, it can be judged whether this kind of quantum computer development route is feasible.

"Director Zhang Wei, show me the principle of quantum coherence sphere technology, and I will understand how you realize this technology."

Zhang Wei used Protoss glasses to send Zhou Yu the technical principle of the quantum coherence sphere. The expression on his face was very strange, curiosity mixed with disbelief.

He thinks that Zhou Yu doesn't understand the technical principle of the quantum coherence sphere at all.

Zhou Yu carefully read the technical principles of the quantum coherence sphere. He understood a little bit, and golden raindrops kept falling in the space of the technology tree in his mind.

The technology tree digests this knowledge and feeds it back to Zhou Yu, who can understand the next knowledge.

Through this positive feedback method, Zhou Yu quickly digested the knowledge of the quantum coherence sphere.

The technology tree in my mind shook for a while, and part of the quantum computer technology grew in the computer technology area.

Zhou Yu instantly learned about the more advanced quantum coherent sphere technology.

At the same time, he knew that the development route of this kind of quantum computer was completely correct.

Zhou Yu stared at Zhang Wei with a smile on his face, and then it was time to show off his skills.

Academician Tian Kai saw Zhou Yu's expression, and he looked at Zhang Wei with caring eyes, not to be hit for a while.

At the same time, many fragments emerged in his mind. They were all discussing technology with Zhou Yu before, and he thought Zhou Yu didn't understand this technology.

Unexpectedly, Zhou Yu interpreted this technology from an alternative perspective and helped him solve the technical difficulties.

(End of this chapter)