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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2.5
QPU
演算の組み合わせ
29
2.4
COPY
：失われた演算
従来のコンピュータで可能であるのに、
QPU
では実装できない演算が
1
つあります。繰り返し実行
することで、既知の状態のコピーをたくさん作る（状態が
∣
0
⟩
か
∣
1
⟩
のどちらかにあれば、単に
WRITE
演算でこれを行う）ことができますが、量子コンピューティングでは、どんな状態かを特定せずにある
状態をコピーする方法はありません。この制約は、キュビットを支配する物理学の基本法則のために
生じるものです。
COPY
がないと確かに不便ですが、
5
章で説明するように、
QPU
では
COPY
命令が使えなくても、そ
の代替となる方法が用意されています。
2.5
QPU
演算の組み合わせ
現時点までに、自由に使える演算として
NOT
、
HAD
、
PHASE
、
READ
、
WRITE
を準備できました。従
来の論理演算と同様に、これらの演算を組み合わせて他の演算を行うこともできます。あるいは、まっ
たく新しい演算を行うこともできます。例えば、
QPU
に
HAD
演算と
PHASE
演算があり、
NOT
演算がな
いとしましょう。例えば、図 2-14に示すように、
PHASE(180)
演算を
2
つの
HAD
と組み合わせて、
NOT
演算とまったく同じものを生成できます。反対に、
PHASE(180)
演算は
HAD
および
NOT
演算の組み合
わせで実現できるのです。
図 2-14
2.5.1
QPU
命令：
ROOT-of-NOT
命令を組み合わせることで、従来の論理演算の世界にはまったく存在しない、
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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.