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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8.4
位相推定の使い方
157
phase_est()
の引数をさらに詳しく見てみましょう。
8.4.1
入力
位相推定は普通は次のように使います。
phase_est(qin, qout, cont_u)
qin
と
qout
はどちらも
QPU
レジスタです。一方、
cont_u
は注目する
QPU
演算を実行する関数に
対する参照です。
qin
固有位相を取得したい固有状態
u
j
にある
n
キュビットからなる入力レジスタ。
qout
m
キュビットの
2
番目のレジスタで、すべて
0
として初期化されたもの。プリミティブは最終
的にこのレジスタを使用して、
qin
に入力する固有状態に対応する目的の角度
θ
j
のバイナリ
表現を返します。一般に、
m
を大きくすると、
θ
j
の表現を得る際の精度が高くなります。
cont_u
固有位相を決定する
QPU
演算
U
に対応する制御付き演算の実装。
cont_u
は、
cont_u(in,
out)
の形式の関数として渡されます。その結果、
n
キュビットレジスタ
out
に
U
を適用する
かどうかを制御する単一のキュビット
in
をとります。
位相推定を利用する具体例として、
HAD
の固有位相を計算してみましょう。表8-1では、
HAD
の固
有状態の
1
つが固有位相
180
°
を持つことを示しました。ここでは例 8-1のコードを使って、
phase_
est()
がこの結果を再現できるかどうかを確かめてみましょう。
サンプルコード
https://oreilly-qc.github.io?p=8-1
で例8-1を実行してみましょう。
例8-1
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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.