Chapter 229 This Time Only 3 Seconds
At the same time, ports 2 and 3 will be closed.
In order to ensure that the experiments before and after can be compared, except for the different circuit structures, other factors must be exactly the same.
After the excitation started, everyone turned their attention to the test equipment.
Among these, the most important data is the crosstalk isolation.
This represents the degree of isolation between control lines against crosstalk.
The larger the data, the better the isolation.
After seeing the data on the screen, everyone couldn't help but be shocked.
"It actually reached 32dB!" Han Shubin thought to himself.
Before this, in the original control line circuit, the crosstalk isolation between control lines was only 12dB.
Han Shubin thought that the circuit structure designed by Xu Youxin might improve the crosstalk isolation to a certain extent.
But I didn't expect the improvement to be so obvious.
From this perspective, the project team's choice to build a superconducting quantum computer with 1,000 qubits is a bit conservative.
It is entirely possible to reach 2,000 quantum bits.
After seeing the ideal result, Xu You breathed a sigh of relief.
This not only proves that Xu You's optimized control line circuit is very effective.
It also proves that the scene simulated in Xu You's mind that day was a complete reproduction of the real scene.
If only Xu You could keep this incredible ability.
That will undoubtedly give me a powerful weapon in my future scientific research.
Immediately afterwards, Xu You excited port 2 and port 3 respectively.
As with port 1, the following two times also increased the crosstalk isolation by about 20dB.
Such experimental data is enough to illustrate the significance of Xu You's optimized circuit.
"Start testing the computing power of superconducting quantum computing immediately!"
With excitement, Han Shubin didn't even bother to affirm Xu You's achievements, and immediately began to arrange new tasks.
"Xu You... this is too awesome!" Chang Xiao said calmly.
This ability to design circuits is not within the scope of work for programmer Chang Xiaoping.
But Chang Xiaoping also knew how difficult this task was.
For so many days, the members of the entire project team have not been able to design such an optimized circuit.
However, Xu You was able to design it within a few days of leaving the project team, and it achieved such an effect.
If Chang Xiaoping hadn't seen it with his own eyes, he would never have believed it.
Next, Xu You and Han Shubin participated in the computing power test of superconducting quantum computing.
Although the new generation of quantum computers has not yet been fully assembled.
But the computing power can already be tested.
As long as it can pass the computing power test and be confirmed to be capable of handling various large-scale computing tasks, it will not be far from practical application.
This time, the computing task performed by the quantum chip is the quantum random circuit sampling task.
For the sake of complete comparison , the new generation of quantum chips has different computing power from the previous generation, but performs exactly the same tasks.
After pressing any start command, Han Shubin, Xu You and others waited for the final calculation results.
This time, the time required to complete the mission was far beyond everyone's imagination.
"Academician Han, the calculations have been completed."
Han Shubin couldn't help but be very surprised when he heard what the staff member said.
"It's done? So quickly? How long did it take?"
Xu You never expected this.
It seemed that the mission was over as soon as Han Shubin gave the start order.
"Three seconds. 3.06 seconds to be exact."
“3 seconds? That’s 100 times faster than the previous generation of superconducting quantum computers!”
Han Shubin remembers clearly that it took a full 300 seconds to perform the same computing task.
Of course, if it is the current top supercomputer, it will take a full 100 years.
From 100 years, to 300 seconds, and then to 3 seconds.
What a great leap this is!
At this time, Xu You couldn't help but ask:
"Academician Han, if a supercomputer were to perform such a task, how long would it take?"
"It will take 100 years." Han Shubin said lightly.
Hearing Han Shubin's words, Xu You couldn't help but tremble in his heart.
Through calculations, Xu You quickly figured out the speed difference between them.
"Academician Han, if that's the case, then the speed of the new generation of superconducting quantum computers is a billion times faster than supercomputers?"
"Yes, that's basically the relationship. So why do we attach so much importance to the quantum computer project? This is a project that may change the landscape of human technology!"
At this time, Xu You suddenly thought of another problem.
If, say, superconducting quantum computers can also complete calculations on superconducting materials.
It is very likely that the superconducting critical temperature of superconducting materials will achieve a new breakthrough.
Even superconductors close to room temperature are not necessarily impossible to find.
Before this period, there has been no new breakthrough in the search for superconducting materials.
Part of the reason is that it is limited by the computing power of supercomputers.
There are many other combinations of elements that cannot be calculated yet.
Because if I want to calculate everything, I don’t know how many years it will take.
Not to mention how much electricity will be consumed during this period.
If superconducting quantum computers really solve this problem.
Then world technology is really entering a new era.
At this time, Han Shubin did not end the experiment immediately .
Instead, the fidelity measurements continue.
Efficient computing speed alone is far from enough.
If you want to truly put it into practical use, high fidelity is an issue that must be taken into consideration.
Otherwise, errors are likely to occur in the transmission of information, which will have a great impact on the stability of quantum computers.
In the fidelity measurement, it is necessary to measure the fidelity of the single-bit gate and the fidelity of the double-bit gate separately.
Generally speaking, the fidelity of a two-bit gate is lower than that of a single-bit gate.
When the logic gate error rate drops by an order of magnitude, the probability of outputting an incorrect result will drop several times.
It is generally believed that 99% fidelity is the threshold for fault-tolerant quantum computing.
As long as the fidelity of the two-bit gate is higher than 99%, it can be said that it has a relatively high practical significance.
After another series of tests, the fidelity test results of the new generation of quantum chips came out.
"Academician Han, the fidelity of the single-bit gate is 99.02%, and the fidelity of the two-bit gate is 98.56%."
Hearing this news, Xu You felt a little disappointed.
The fidelity of the two-bit gate is almost reaching 99%.
Even compared to the previous generation of superconducting quantum computers, the fidelity is slightly lower.
Xu You thought that it might be because the number of quantum bits had greatly increased.
But Han Shubin's expression was very relaxed, as if he didn't care about it.
"Xu You, your quantum error correction code has not been used yet."
