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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8.3
位相推定は何を行うか？
155
ついても
HAD
は何も変えていないことになります。
このように、
QPU
演算に対して変化しない状態（グローバルな位相を除く）は、演算の固有状態と呼
ばれます。すべての
QPU
演算には、そのような特殊な状態からなる別個の独特なセットが対応してい
ます。このセットには、重要でないグローバルな位相が付与されています。
固有状態が持つグローバルな位相は観察できませんが、この位相を生み出す
QPU
演算についての情
報を引き出すことができます。特定の固有状態のグローバルな位相は固有位相と呼ばれます。
いま見ている例では、
HAD
は
2
つ の（ 実 は 、
2
つだけの）固有状態を持っています。それらの固有位相
は表 8-1に示す通りです。
表8-1
固有状態 固有位相
0
°
180
°
繰り返しになりますが、表8-1に示す特定の固有状態（およびそれに対応する固有位相）は
HAD
だけ
に特有です。他の
QPU
演算はまったく異なる固有状態と固有位相を持ちます。実際、ある
QPU
演算
の固有状態と固有位相はその演算を一意に決めます。他の
QPU
演算が同じ固有状態と固有位相を持つ
ことはありません。
8.3
位相推定は何を行うか？
固有状態と固有位相の概念に慣れたでしょうか？
ここでは、位相推定プリミティブが何を行うかを
説明しましょう。位相推定は、
QPU
演算の固有状態に対応する固有位相を決定するもので、すべての
固有位相の重ね合わせを返します。グローバルな位相は通常は観測不可能な量なので、
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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.