Notification of closing

“Physics Memo” has been used by many people since it was opened in November 2017, but due to various reasons, it will be closed on February 28, 2021.

We would like to express our deepest gratitude for your patronage.

What Is Quantum Computers?


On 20th November 2017, NTT announced a system using domestic quantum computer for general people. Recently we often hear about quantum computers, but what is the difference between such computers and ordinary computers?

In this article, I will briefly touch on the difference between quantum computer and conventional computer, and a quantum dot used for quantum computer.