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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44
3
章 多重キュビット
3.3.1
多重キュビットレジスタの中の単一キュビットの読み取り
多重キュビットレジスタに含まれる単一キュビットに対して
READ
演算を実行すると、何が起こるで
しょうか？
READ
演算も演算対象ペアに対して行われます。多重キュビットの円表示がある場合、その
キュビットの演算対象ペアの
∣
0
⟩
側（ 左 側 ）に あ る す べ て の 円 の 半 径 の
2
乗を加えていくことによって、
1
つの単一キュビットに対して
0
が得られる確率を決定することができます。同様に、キュビットの演
算対象ペアの
∣
1
⟩
側（右手）にあるすべての円の半径の
2
乗を加えていくことによって、出力が
1
となる
確率を決定することができます。
READ
後の多重キュビットレジスタの状態は、どの結果が発生したかを反映して変化します。図3-7
に示すように、結果に一致しない円はすべて削除されます。
結果
1
READ
結果
0
図3-7
READ
＊
1
最 初 の キ ュ ビ ッ ト（
0x1
）で
1
という結果を読み出すことになるのは
∣
1
⟩
と
∣
3
⟩
の両方の状態です。こ
れは、
1
と
3
の
2
進法表示においては、どちらも第
1
ビットが
1
になっているためです。読み出しによる
取捨選択の後で状態が再度規格化され、その領域（つまり対応する確率）の和が
100 %
になることに注
意してください。複数のキュビットを読み取るためには、演算対象ペアに関する処方箋に従って、単
一キュビットの
READ
演算を
1
つず ...
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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.