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.
154
8
章 量子位相推定
8.2
固有位相は有用な情報を提供する
位相推定によって、
QPU
演算のどのような性質が明らかになるのでしょうか？例を通してこの質問
に答えるのが最も簡単でしょう。一例として、既におなじみの
HAD
に注目しましょう。単一のキュビッ
トレジスタに作用すると、
HAD
は
∣
0
⟩
と
∣
1
⟩
を、図8-1に示すようにまったく新しい状態に変換します。
図8-1
∣
⟩
∣
⟩
同様に、他の多くの入力状態に対して、
HAD
はまったく新しい状態を出力します。ここで、図8-2に
示した
2
つの特殊な入力状態に対する
HAD
の作用について考えてみましょう。
図8-2
最初の入力状態は、両方の成分が同位相になっており、状態
∣
1
⟩
で読み出される確率は
14.64 %
です。これに対し、
2
番目の入力ではその成分が
180
°
逆位相になっており、状態
∣
0
⟩
にある確率は
14.64 %
です
＊
1
。
HAD
がこれらの状態にどのように作用するかに注意してください。
1
番目はまったく変更されていま
せん。一方、
2
番目の例では
180
°
というグローバルな（
global
）位相を獲得します（相対位相は変更され
ま せ ん ）。
2
章においてグローバルな位相は観測不可能であると述べました。このため、
2
番目の状態に
＊
1
この確率の実際の値は
sin
2
(22.5)
。
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.