Chapter 646 (2/2)

”Landing successful!”

On the back of the moon, the edge of the wisdom sea once again welcomes guests. This time, it's a giant tiannv.

Chen Mo named the melting hole area ”ant hole area”.

After several months of continuous launching of construction machines and helium-3 extraction machines, today's ant cave area is a bit busy. Whether it's day or night, the machines can work normally.

Now it's the time of the month and the day. We can see that more than ten helium-3 extractors are working. We need another helium-3 extractor to collect helium-3 and store it in the storage tank not far from the slurry tunnel.

There's no sound here. It's as quiet as death.”Please note that the transport compartment is open.”

Tiannv's artificial intelligence opens the cabin door of the transport cabin, the robot in the transport cabin opens the safety belt of the fixed equipment, all kinds of machinery and equipment start, slowly leave the transport cabin and enter the moon.

With the exception of five helium-3 extraction robots, all the other robots head into the slurry tunnel.

This time, there are a lot of them, and the size of the machine is also a circle larger than that transported by the shennu. There is also a toolbox with several robot drills, so that the robot can replace itself.

A transport robot, carrying the helium-3 collection cabin, arrives at a predetermined position next to the slurry tunnel and puts it down. It takes the collection cabin which has been fully collected and returns to the tiannv.

The one ton collection cabin is equipped with a refrigeration system, and there are 100kg of helium-3 in it. This is collected by the helium-3 extraction robot, which will be used as fuel for controlled nuclear fusion back to earth.

”Earth, this is the tiannv. All tasks are completed. Please return.”

After all the robots are put in, the helium-3 collection cabin is recovered, and several robots are loaded with some lunar rocks and lunar soil, the artificial intelligence of tiannv sends out a request signal.

”Return allowed.”

In the laboratory of Building 1, Mo Nu received the signal and passed the instruction.

”MEG, the maiden is back.”

”Well.”

Chen Mo, who is in front of the experimental platform, responds and looks at the design drawing of the quantum chip in front of him.

This is the quantum chip design drawing made by Mo Nu according to his idea.

The importance of making quantum computer is self-evident.

Quantum chip needs to integrate the quantum circuit into the substrate to carry quantum information processing. There are many ways of quantum chip, including superconducting system, micro nano photonics system, atomic system, ion system and semiconductor quantum dot system.

Chen Mo chose to study superconducting system.

At present, he has room temperature superconducting materials, and the technology of superconducting quantum chip system is relatively difficult to realize.

In the field of quantum chip research, Chen Mo has several technical solutions obtained in the library of science and technology, and combines some theories in reality to choose the best, hoping to develop a more efficient quantum chip.

At present, the difficulty is to extend the decoherence time of qubit.

Quantum coherence refers to the special connection between quantum, by which other quantum states can be deduced from one or more quantum states.

If a string of quantum bits are related to each other, we can regard this string of quantum bits as a ”community of destiny”. If we deal with one of the bits, it will affect the operation status of other bits. The quantum computer can operate efficiently, which is based on this characteristic of quantum.

Decoherence is the collapse of wave function, one of the basic mathematical characteristics of quantum mechanics.

The simple explanation is that there are continuity probability amplitudes of 0 to 1 states, which suddenly change to a specific function point of 0 or 1 at the moment of ”observation”.

One image explanation is that in Schrodinger's cat experiment, when Schrodinger didn't open the box to ”observe” the cat, the cat only lived in the box with a certain probability, in the superposition state of not living or dying, that is, life and death. When Schrodinger opened the box to ”observe”, the existence of the cat's original uncertain life and death suddenly changed into reality, life or death, that is, 0 or 1, One of them.

The operation time of quantum computer is affected by quantum decoherence.

The coherence between qubits is difficult to maintain for a long time. Once the external entities are observed, the coherence of qubits will be lost.

In a computer, quantum bits interact with the external environment and decoherence occurs. The time from the coherent state to the loss of coherent state is the decoherence time. If the decoherence time is not long enough, the quantum computer cannot calculate it.

Increasing decoherence time is not only the difficulty of quantum chip technology, but also one of the problems that Chen Mo is now studying and solving.

In addition to extending the decoherence time of qubits, realizing the preparation, measurement and control of spin qubits, Chen Mo is now studying the subject.

Among the technical theories Chen Mo got from the library of science and technology, superconducting quantum interference is the best theoretical technology he can use to control micro quantum states.

In addition, in terms of control accuracy, it is necessary to break through the fault-tolerant quantum threshold before the quantum chip can succeed.

In order to ensure the effectiveness of scalable quantum computing, the error rate of logic operation can not exceed 10 orders of magnitude. In order to achieve this fault tolerance, Chen Mo chooses topological quantum error correction as the research direction.

The topological properties of quantum states are used in the quantum error correction process.

This theory is recorded in the quantum data of science and Technology Library, and there are similar topological quantum error correction theory in real science, which is the highest fault tolerance quantum computing scheme that can be realized by the existing technology.

”Go to the lab.”

Chen Mo stands up from the platform, lets Mo Nu store the data of quantum chip design, and goes to the quantum lab. Now the uncertain method is not feasible. He needs to test his ideas and ideas with experiments.