Inorab quantum computer becomes the god of the new world!?

Google's quantum transcendental achievement = the first flight of the light brothers!?

　Following the first part, we will deliver an interview with Professor Fujii, a leading person in quantum computer research.

――The Fujii -sensei has heard one of the reviewers of the papers on quantum transcendence published by Google in 2019.After that, IBM has been refuted, and in the first place the definition of quantum transcendence is how many times the difference is transcendent, but how is the teacher evaluated?

Fujii: I think that's pretty amazing.The reason is that since the concept of quantum computers was proposed in 1985, it has reached the level of the first time to compete with classical computers (editions: existing semiconductor computers).In addition, Google entered in 2014, and the number of quantum bits was only 5.

　For example, even if all 5 quantum bits are written in a formula, it can be represented by 2 5 -square = 32 numbers.If you do your best, we can handle it.Furthermore, if you move a simulation using Python on my laptop, it will move quickly up to about 29 quantum bits.

――Google has evolved the quantum computer before you can compete with a classic computer that has not been able to stand for more than 30 years in just five years from there!

Fujii: In the first place, until the 2014 entry, the level of "I had one quantum bit" or "I made two quantum bits side by side" has been a long time.However, Google will increase to 9 quantum bits the year after entering and 22 quantum bit in 2017.The surrounding IBMs and venture companies IOQs have reached a tens of quantum bits, and the neighborhood will be active.

　When it comes to 20 quantum bits, a 30-40MB memory is required to simulate with my laptop, but it still can be managed on the laptop.That has exceeded the 50 quantum bit in the next step.The story will change at this point.If you want to reproduce this with a simulation, you need a 16PB to secure a straightforward memory.Even if you use a supercon, the memory will be severe.

Professor Keisuke Fujii, Department of Basic Engineering, Osaka University.His main books include "Amazing quantum computer" and "quantum calculation based on observation"

――It's exactly different.

Since 2014 when Fujii Google entered, it seems that the development of quantum computers has recently stagnant among those who have been interested in the last few years, but he said, "No, please wait."(smile)

　He said he had been studying with 1-2 quantum bit for nine years from 2005 to 2014.If you think it was 5 in 2014, it increased to 9 the following year, and it became 22 in two years when I thought it was amazing, and if I said that it was dangerous, it would reach 50 in two years.It has evolved smoothly in a short period of time!

　Until a while ago, it was fine to do one quantum bit, but it was at the level of hand, but now I'm competing with the supercomputer.It can be said that you have finally stood at the entrance as a calculator system.

　So, what was the case was a physical experiment.People who are interested in physics have been motivated to "control the ultimate quantum mechanics and observe them as physical phenomena."

　That has changed to "Creating a computer" since 2014.As a result of the completely changed tide, a new milestone was set.The content is, "Winth the classical computer. However, this is like reconstructing a computer from zero, so it is difficult to compete with a sudden useful problem. So any task is fine, mathematically.Win the existing computer with a task that can be defined properly. "

-- So that's it.

Fujii For example, the first flight of the light brothers was not a practical flight in a little 10 seconds.If you use such a thing, it is faster to run by car.However, more than 100 years have passed, and now a jumbo jet aircraft flies, launching a rocket in space, and it has been commercialized.

　Therefore, I think it is important to first prove that you can move without putting your feet on the ground.People influenced by the proof go on, "Let's think about how to fly a little longer."

　In that sense, Google's quantum transcendental milestones showed the possibility that quantum computers would surpass the conventional computer as a computing machine if a system was properly created, rather than a mere experimental of physics.Until then, it changed from "Is it really possible to make a quantum computer?" And "How to make a quantum computer? How do you use it?"I think it's a historic milestone in terms of changing the phase.