Chapter 568

"Please come in!"

Academician Guo's tough voice came from inside the door.

Gu Lu pushed the door in and saw Academician Guo reading a document wearing reading glasses.

Looking up and seeing that it was Gu Lu who pushed the door in, Academician Guo smiled and pointed to the sofa on the side, "Professor Gu has arrived, come, sit down first." ”

Gu Lu sat on the sofa with his hands on his knees, "Academician Guo, I'm here to discuss with you about the part of the subject that we are responsible for." ”

Academician Guo nodded, put down the document in his hand, and his eyes fell on Gu Lu, "Is there a bit of pressure now?"

Gu Lu smiled bitterly and nodded, "It's a little." ”

"It's nothing. Academician Guo waved his hand and said with a smile, "Pressure is not necessarily a bad thing, the important thing is to transform pressure into motivation." ”

Gu Lu nodded, indicating understanding.

"It can be said that now the whole project is almost all on you and me, and we cannot fail, let alone fail. ”

"We must be firm in a belief, a belief in winning!"

After Academician Guo gave Gu Lu a short period of psychological counseling and chicken soup indoctrination, he went straight to the point.

"Before we start the research work, we need to determine a few things. Academician Guo looked at Gu Lu and spoke slowly.

"The first thing is to determine the number of qubits in the semiconductor chip that we want to develop. ”

Determining the number of qubits is a crucial part.

The number of qubits is a fundamental determination of the performance of a quantum computer.

The higher the number of qubits, the better the performance of the quantum computer.

This is not the same as qubit encoding.

Qubit encoding is a small improvement in the performance of a quantum computer while the number of qubits remains the same.

But the number of qubits is different.

Each increase in the number of qubits is a seismic change in the performance of a quantum computer.

The amount of computation becomes larger, and the computing speed becomes faster.

For the same problem, it would take a quantum computer with three qubits to produce results in one or two hundred years, but with a quantum computer with 30 qubits, it is estimated that it can be solved in half an hour.

This is a qualitative change.

Because it's not an additive relationship, it's an exponential relationship.

Thirty qubits, which is a threshold to distinguish between a quantum computer in the true sense and a semi-finished quantum computer.

Now on the project team's side, the ten-qubit chip is in the process of research and development, and Gu Lu and Academician Guo are responsible for the research and development of a higher number of qubit chips.

As for how many qubits this higher number is, it needs to be decided after discussion between Academician Guo and Gu Lu.

Anyway, the number is higher than twenty and less than or equal to thirty.

But neither Academician Guo nor Gu Lu were ready to enter the 30-qubit chip as soon as they came up.

So, after some discussion, the number was set at twenty-five!

This number is the same as the number of qubits in the semi-finished product of the commercial quantum computer in the United States exposed in the news yesterday.

Therefore, the goal of Gu Lu and Academician Guo in the next stage is to develop semiconductor chips with 25 qubits.

Once Gu Lu and Academician Guo succeed in research and development, it means that they can temporarily catch up with the progress that Mi Guo is currently in.

"Okay, then this matter is decided, 25-qubit semiconductor chips, this is our goal in the first phase. ”

"After the successful development of the 25-qubit chip, we went directly to the 30-qubit semiconductor chip. Academician Guo directly decided.

It's different from the situation in the United States.

The research institute in the United States has plenty of time, but it can increase the number of qubits step by step on the basis of 25 qubits, and stabilize it step by step.

But it's not the same on their side.

Time does not allow them to adopt this strategy of steady progress, but can only jump to the research and make a large number of leaps.

In this way, there will be a slight opportunity.

Regarding Academician Guo's decision, Gu Lu nodded in agreement.

"Then set the number of twenty-five, since the people of the United States can develop a superconducting chip with twenty-five qubits, then why can't we. Gu Lu's words were very heroic.

Academician Guo laughed, "That's right. ”

"Next, let's discuss the second thing, the experimental plan!"

Experimental plan, this is the key to the research of the subject!

An excellent set of experimental protocols can often achieve twice the result with half the effort.

Just like the two research groups that Gu Lu stayed in not long ago, it is precisely because Gu Lu proposed a very good experimental plan that the project cycle has been greatly shortened.

Academician Guo put one hand on the table, rubbed his chin with the other, and looked at Gu Lu with a smile, "I've always heard Ai Liang say that you often have amazing actions every time you communicate experimental plans, so what do you think about our current topic?"

After a few seconds of silence, Gu Lu softly spit out a few words, "Qubit entanglement!"

Academician Guo had a happy smile on his face, "We really see the same thing, and the plan I came up with is also quantum entanglement." ”

Before explaining what quantum entanglement is, it is necessary to clarify a question.

The increase in the number of qubits is not simply the addition of qubits to semiconductor chips.

In simple terms.

Just arranging the qubits on the chip doesn't work.

Some time ago, the research team led by Gu Law Firm overcame two major problems in the field of graphene semiconductors, so that the number of qubits that can be accommodated on the chip is no longer a limit.

If the increase in the number of qubits is just a simple addition problem, let alone Academician Guo and Gu Lu, even if it is only Gu Lu alone, give Gu Lu a week, and Gu Lu can make a 30-qubit chip.

But this is clearly not the case.

For semiconductor quantum chips to be adapted to quantum computers, the optimal control of qubit superposition, entanglement, measurement and error correction is the key.

Each additional qubit requires a new calculation of the entanglement state.

For example, the twenty-five-qubit chip that Gu Lu is about to study.

There are two states in one qubit.

Then twenty-five qubits are a total of 2^25, a total of 33554432 entangled states.

This is a rather complex issue.

Quantum entanglement, on the other hand, refers to the phenomenon that when several particles interact with each other, the properties of each particle cannot be described separately, but only the properties of the overall system, because the properties of each particle have been synthesized into the overall properties.

Gu Lu and Academician Guo unanimously concluded that quantum entanglement is a perfect solution to the current dilemma.