Pratique du Shadowing: What in the world is topological quantum matter? - Fan Zhang - Apprendre l'anglais à l'oral avec YouTube

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Duncan Haldane and Michael Kosterlitz won the award for discovering
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that even microscopic matter at the smallest scale can exhibit macroscopic properties and phases that are topological.
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But what does that mean?
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First of all, topology is a branch of mathematics that focuses on fundamental properties of objects.
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Topological properties don't change when an object is gradually stretched or bent.
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The object has to be torn or attached in new places.
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A donut and a coffee cup look the same to a topologist because they both have one hole.
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You could reshape a donut into a coffee cup,
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and it would still have just one.
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That topological property is stable.
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On the other hand, a pretzel has three holes.
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There are no smooth incremental changes that will turn a donut into a pretzel.
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You'd have to tear two new holes.
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For a long time, it wasn't clear whether topology was useful for describing the behaviors of subatomic particles.
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That's because particles, like electrons and photons,
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are subject to the strange laws of quantum physics,
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which involve a great deal of uncertainty that we don't see at the scale of coffee cups.
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But the Nobel laureates discovered that topological properties do exist at the quantum level,
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and that discovery may revolutionize materials science,
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electronic engineering, and computer science.
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That's because these properties lend surprising stability and remarkable characteristics to some exotic phases of matter in the delicate quantum world.
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One example is called a topological insulator.
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Imagine a film of electrons.
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If a strong enough magnetic field passes through them,
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each electron will start traveling in a circle,
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which is called a closed orbit.
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Because the electrons are stuck in these loops, they're not conducting electricity.
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But at the edge of the material,
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the orbits become open, connected,
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and they all point in the same direction.
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So electrons can jump from one orbit to the next and travel all the way around the edge.
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This means that the material conducts electricity around the edge,
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but not in the middle.
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Here's where topology comes in.
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This conductivity isn't affected by small changes in the material,
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like impurities or imperfections.
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That's just like how the hole in the coffee cup isn't changed by stretching it out.
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The edge of such a topological insulator has perfect electron transport.
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No electrons travel backward, no energy is lost as heat,
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and the number of conducting pathways can even be controlled.
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the electronics of the future could be built to use this perfectly efficient electron highway.
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The topological properties of subatomic particles could also transform quantum computing.
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Quantum computers take advantage of the fact
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that subatomic particles can be in different states at the same time to store information in something called qubits.
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These qubits can solve problems exponentially faster than classical digital computers.
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The problem is that this data is so delicate that interaction with the environment can destroy it.
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But in some exotic topological phases,
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the subatomic particles can become protected.
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In other words, the qubits formed by them can't be changed by small or local disturbances.
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These topological qubits would be more stable,
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leading to more accurate computation and a better quantum computer.
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Topology was originally studied as a branch of purely abstract mathematics.
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Thanks to the pioneering work of Thales,
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Haldane, and Kosterlitz, we now know it can be used to understand the riddles of nature
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and to revolutionize the future of technologies.

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Why practice speaking with this video?

Engaging with the video titled "What in the world is topological quantum matter?" is an excellent opportunity for english speaking practice. The content, which delves into complex scientific concepts, encourages learners to articulate thoughts on challenging topics, thereby enhancing their ability to express complex ideas fluently. By discussing themes such as topology and quantum matter, you will not only broaden your vocabulary but also improve your critical thinking skills in English.

Furthermore, this video facilitates enhanced listening skills, as the speaker uses a range of vocabulary and constructs sentences that are rich in content. By practicing speaking through repetition and paraphrasing, learners can greatly benefit from the shadowing technique. This practice helps to build confidence when explaining scientific phenomena, which may come up in academic discussions or exams, like the IELTS speaking practice.

Grammar & Expressions in Context

While watching the video, you can observe several essential grammatical structures that are beneficial for learners:

  • Relative Clauses: "that even microscopic matter at the smallest scale can exhibit macroscopic properties." This structure is useful for adding detail to your sentences, making your speech more sophisticated.
  • Conditional Statements: "if a strong enough magnetic field passes through them..." Learning to use conditionals effectively will enhance your ability to discuss hypotheses and potential outcomes.
  • Comparative Expressions: "just like how the hole in the coffee cup isn't changed by stretching it out." This comparative structure allows you to create relatable examples in your discussions, making complex ideas easier to understand.

Practicing these structures in your speaking will help you articulate responses clearly and persuasively in English.

Common Pronunciation Traps

There are several pronunciation challenges present in the video that learners should aim to master:

  • Topological: Ensure that you pronounce this word accurately as ‘to-puh-loh-ji-kul.’ Mispronunciation can lead to misunderstandings in technical discussions.
  • Conductivity: Pay attention to the rhythm of this term: ‘kon-duhk-tiv-i-tee.’ Emphasizing the correct syllables will aid in clarity when discussing scientific concepts.
  • Quantum: This word is commonly mispronounced as ‘kwantum’ instead of ‘kwon-tum.’ Mastering this pronunciation will help you sound more fluent in conversations about physics or advanced technology.

By focusing on these pronunciation traps, you can improve your English pronunciation, making your spoken English sound more professional and polished in any context, especially in academic or technical discussions.

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

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