August 2020
Beginner to intermediate
332 pages
8h 16m
Japanese
book
動かして学ぶ量子コンピュータプログラミング ―シミュレータとサンプルコードで理解する基本アルゴリズム
by Eric R. Johnston, Nic Harrigan, Mercedes Gimeno-Segovia, 北野 章, 丸山 耕司
Content preview from 動かして学ぶ量子コンピュータプログラミング ―シミュレータとサンプルコードで理解する基本アルゴリズム
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146
7
章
QFT
：量子フーリエ変換
7.6
QPU
の内部
図7-24 は、
1
キュバイトの信号に
QFT
を実行する基本的な
QPU
演算を示しています。
図7-24
ここでの課題は、図7-24での単純な
QPU
演算の配置が入力レジスタの信号から周波数成分をどの
ように抽出するかを理解することです。
QFT
について説明するには、この回路が図 7-6のような入力状態でどのように動作するかを考える
必要があります。ここで、位相はレジスタで周期的に変化します。この作業は難解です。簡便で単純
なアプローチを採用し、どのように逆
QFT
が働くかの説明を試みてみましょう。
invQFT
を理解できれ
ば、
QFT
は単にその逆なので、理解は容易なはずです。
4
キュビットの入力からなる単純な場合では、
invQFT
は図 7-25のように分解することができます。
図7-25
これは
QFT
回路と非常によく似ていますが、位相が異なることが決定的に違います。図 7-26は、値
2
を含むレジスタに前の回路を適用した際に得られる状態を示します。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.