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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125
7
章
QFT
：量 子フーリエ 変 換
量子フーリエ変換（
Quantum Fourier Transform
：
QFT
）は 、
QPU
レジスタの相対位相と大きさの
中に隠れているパターンや情報にアクセスするためのプリミティブです。振幅増幅は、相対位相の差を
読み取り可能な振幅の大きさ（
magnitude
）の差に変換するものでした。これに対して、
QFT
プリミティ
ブは位相を操作する独特な方法を持っています。
QFT
プリミティブは、この位相操作の実行に加えて、
レジスタの複雑な重ね合わせを手間をかけず準備することで、重ね合わせ状態のままで計算するのに
役立つものです。この章では、直接的な
QFT
の応用例を紹介し、それからこのツールの詳細について
説明します。好奇心旺盛な読者のために、「7.6 QPU の内部」のセクションでは、
QFT
の
1
つ
1
つの演
算を詳しく調べていくことにします。
7.1
隠れたパターン
6
章に示した「状態推測ゲーム」（
state guessing game
）を少し頑張って作ってみましょう。まず、図
7-1に示した
3
つ の 状 態（
A
、
B
、または
C
）の い ず れ か を 含 む
4
キュビットレジスタがあるとします。こ
こでは、どの状態であるかはわかりません。
図7-1
これらは、
6
章で議論した
A
、
B
、
C
の状態と同じ状態ではありません。
この図から、これらの状態はそれぞれ異なることがわかります。しかし、これらの各状態のすべての
126
7
章
QFT
：量子フーリエ変換 ...
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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.
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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.