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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
236
12
章 ショアの素因数分解アルゴリズム
2
x
mod(N)
に対する最大反復周期
N
の ビ ット 数
図12-2
N
N
従来型の
CPU
で素因数を発見するより効率的な方法（一般数体ふるい法（
General Number
Field Sieve
）のような方法）は存在しますが、どの方法も
N
に対して同様のスケーリング問
題に直面します。最も効率的な素因数分解アルゴリズムを使うと実行時間は
N
に対して指数
関数的にスケールするのですが、ショアのアルゴリズムの実行時間は
N
の多項式に従ってス
ケーリングされます。
では、
QPU
を使う方法について見ていくことにしましょう。
12.2.2
量子的なアプローチ
次のセクションで
ShorQPU()
の仕組みを
1
ステップずつ説明します。その中でよく用いる
QFT
につ
いて、そのクリエイティブな利用法を少し説明しておきましょう。
すぐ後で示すように、最初に
HAD
演算を何回か使うことによって、
QPU
レジスタの振幅の大きさと
相対位相で表される
a
x
mod(N)
を
ShorQPU()
で計算します。
7
章で
QFT
が 離 散 フ ー リ エ 変 換（
DFT
）
を行い、出力
QPU
レジスタを入力に含まれるさまざまな周波数の重ね合わせの状態にしたことを思い
出してください。
図 12-3 は
a
x
mod(N)
に
DFT
を適用した結果を示します。 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.