EigoPro 準1級 読解 — The Quantum Leap

Every few years, a technology arrives draped in such extravagant promises that distinguishing genuine breakthrough from marketing froth becomes a discipline in itself. Quantum computing is the latest candidate. Headlines speak of machines that will crack any code, design miracle drugs overnight, and render today's supercomputers obsolete. The reality is at once more modest and more interesting, and grasping it requires setting aside the seductive but misleading image of a computer that simply "tries every answer at once." A classical computer stores information in bits, each of which is either a 0 or a 1. A quantum computer uses qubits, which exploit two peculiar features of subatomic physics. Through superposition, a qubit can occupy a blend of 0 and 1 simultaneously; through entanglement, the state of one qubit becomes inseparably linked to another, however far apart they sit. These properties allow a quantum machine to explore an enormous space of possibilities in parallel. Crucially, however, the answer is not simply read off. The art lies in choreographing the qubits so that wrong answers cancel out and the right one emerges with high probability—a delicate orchestration that only a narrow class of problems happens to suit. That narrow class, admittedly, includes some valuable targets: factoring the large numbers that secure online communications, and simulating molecules too complex for ordinary chemistry. Yet today's quantum processors remain maddeningly fragile. Qubits lose their quantum character within fractions of a second, corrupted by the faintest heat or vibration, so most of a machine's capacity is consumed correcting its own errors rather than computing. Useful, fault-tolerant machines, if they arrive at all, are probably a decade away. The honest verdict is that quantum computing will not replace your laptop; it will, in a handful of specialised domains, do things no laptop ever could. That is remarkable enough without the hyperbole.

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この単元の問題を3問、解説つきで公開しています

準1級 · 読解 · 全5問

問 1

What is the main idea of the passage?

  • Quantum computing is pure marketing froth with no real scientific basis.
  • Quantum computers will soon make ordinary laptops and supercomputers completely obsolete.
  • Quantum computers work by simply trying every possible answer at the same time.
  • Quantum computing is genuinely powerful for a few special problems but far less universal than the hype suggests.
Phrase

The reality is at once more modest and more interesting

準1級読解科学技術ジャーナリズム主旨把握
⚡ひとことで

本文全体は「量子計算は誇大広告ほど万能ではないが、特定問題では本物の力を持つ」という論旨。

選択肢の解説Choice Analysis

「Quantum computing is genuinely powerful for a few special problems but far less universal than the hype suggests.」

正解

本文は (1) 量子計算が誇大な約束に包まれている→ (2) 仕組み (重ね合わせ・もつれ) と『一部の問題にしか向かない』限界→ (3) 価値ある用途はあるが脆弱で実用は10年先、と展開し、The reality is at once more modest and more interesting と要約する。最終段の it will, in a handful of specialised domains, do things no laptop ever could が結論で、「少数の特殊問題には本物の力を持つが、宣伝ほど万能ではない」が主旨。

  • 「Quantum computers will very soon make all ordinary laptops and supercomputers completely obsolete.」

    = じきにラップトップや超計算機を時代遅れにする ━ 本文は冒頭でこれを『誘惑的だが誤解を招くイメージ』として退け、will not replace your laptop と明言しているので逆。

  • 「pure marketing froth with no real scientific basis」

    = 科学的根拠のない宣伝に過ぎない ━ 本文は valuable targets や remarkable enough と価値を認めており、全否定はしていない。

  • 「simply trying every possible answer at the same time」

    = ただ全ての答えを同時に試す ━ 本文はこのイメージを seductive but misleading と明確に否定している。

▦Collocation
パターン意味例
draped in extravagant promises誇大な約束に包まれてa technology draped in extravagant promises
at once A and BAでありながらBでもあるat once more modest and more interesting
set aside ~~を脇に置くsetting aside the misleading image
render ~ obsolete~を時代遅れにするrender supercomputers obsolete
the latest candidate最新の候補the latest candidate for hype
❝例文

  • The reality is at once more modest and more interesting.

    現実はより控えめでありながら、より興味深い。

  • New gadgets often arrive draped in extravagant promises.

    新しい機器はしばしば誇大な約束に包まれて登場する。

  • We must set aside the misleading image first.

    まず誤解を招くイメージを脇に置かねばならない。

💡Tip · 覚えるコツ

主旨設問は冒頭の問題提起 (hype) と最終段の結論文 (remarkable ... without the hyperbole) の両端を結ぶ。両端で『誇大さの否定+真価の肯定』が一致する選択肢が正解。

問 2

According to the passage, how does a quantum machine arrive at a useful answer?

  • By reading the correct answer directly off a single qubit once the calculation ends.
  • By guaranteeing that every problem it is given will have exactly one solution.
  • By storing each answer in a separate classical bit and comparing them afterwards.
  • By arranging the qubits so that wrong answers cancel out and the correct one emerges with high probability.
Phrase

choreographing the qubits so that wrong answers cancel out and the right one emerges with high probability

準1級読解科学技術ジャーナリズム詳細把握
⚡ひとことで

量子機は qubit を振付けし、誤答を相殺させ正答を高確率で浮かび上がらせる。

選択肢の解説Choice Analysis

「By arranging the qubits so that wrong answers cancel out and the correct one emerges with high probability.」

正解

第2段で the answer is not simply read off と述べた直後、The art lies in choreographing the qubits so that wrong answers cancel out and the right one emerges with high probability と説明する。choreograph を arrange に言い換え、cancel out / emerges with high probability をそのまま含む選択肢が正解。

  • 「reading the correct answer directly off a single qubit」

    = 単一qubitから直接答えを読み取る ━ 本文は the answer is not simply read off と明示的に否定している。

  • 「storing each answer in a separate classical bit」

    = 各答えを別々の古典ビットに保存する ━ それは classical computer の仕組みで、量子機の動作説明ではない。

  • 「By guaranteeing that every problem it is given will have exactly one solution.」

    = 全問題に解が一つだと保証する ━ 本文にそのような保証の記述はない。高確率で浮かび上がるだけ。

▦Collocation
パターン意味例
read off ~~を読み取るthe answer is not simply read off
cancel out相殺されるwrong answers cancel out
emerge with high probability高確率で現れるthe right one emerges with high probability
the art lies in ~妙味は~にあるthe art lies in timing
explore in parallel並行して探索するexplore possibilities in parallel
❝例文

  • The right answer emerges with high probability.

    正答は高い確率で浮かび上がる。

  • The wrong paths cancel out one another.

    誤った経路は互いに相殺される。

  • The art lies in choreographing the timing.

    妙味はタイミングを振付けることにある。

💡Tip · 覚えるコツ

detail 設問は本文の比喩動詞 (choreograph) を平易語 (arrange) に置換した肢が正解になりやすい。否定文 (not simply read off) を裏返した肢はひっかけ。

問 3

Why, according to the passage, do current quantum processors waste much of their capacity?

  • Qubits quickly lose their quantum character, so most capacity is spent correcting errors rather than computing.
  • They are deliberately limited so that they cannot break online encryption.
  • They are missing the entanglement needed to perform any calculation at all.
  • They run too many useful programs at once and overheat as a result.
Phrase

most of a machine's capacity is consumed correcting its own errors rather than computing

準1級読解科学技術ジャーナリズム詳細把握
⚡ひとことで

qubit は一瞬で量子的性質を失い、能力の大半が誤り訂正に費やされる。

選択肢の解説Choice Analysis

「Qubits quickly lose their quantum character, so most capacity is spent correcting errors rather than computing.」

正解

第3段で Qubits lose their quantum character within fractions of a second, corrupted by the faintest heat or vibration と述べ、so most of a machine's capacity is consumed correcting its own errors rather than computing と続く。これを言い換えた『量子的性質を急速に失い、能力の大半が計算でなく誤り訂正に使われる』が正解。

  • 「They are deliberately limited so that they cannot break online encryption.」

    = 暗号を破れないよう意図的に制限 ━ 本文に意図的制限の記述はなく、暗号解読はむしろ価値ある用途として挙げられている。

  • 「They run too many useful programs at once and overheat as a result.」

    = 有用なプログラムを動かしすぎて過熱 ━ 本文の熱は qubit を壊す外的要因であり、プログラム過多による過熱とは述べていない。

  • 「They are entirely missing the entanglement that is needed to perform any useful calculation at all.」

    = 計算に必要なもつれが欠けている ━ 本文はもつれを量子機の基本特性として説明しており、欠けているとは言っていない。

▦Collocation
パターン意味例
lose one's character本来の性質を失うqubits lose their quantum character
within fractions of a secondコンマ数秒でdecohere within fractions of a second
be corrupted by ~~に損なわれるcorrupted by the faintest vibration
be consumed ~ing~することに費やされるcapacity consumed correcting errors
A rather than BBよりむしろAcorrecting errors rather than computing
❝例文

  • The signal was corrupted by the faintest vibration.

    信号はごくわずかな振動で損なわれた。

  • Much of the capacity is consumed correcting errors.

    能力の多くが誤り訂正に費やされる。

  • It cools down within fractions of a second.

    それはコンマ数秒で冷える。

💡Tip · 覚えるコツ

因果設問では『原因 (lose ... character / corrupted) → 結果 (capacity consumed correcting errors)』の連鎖を探す。本文に無い『意図的制限』『過熱』はいずれも作り話の典型。

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