Placeholder Image

字幕列表 影片播放

由 AI 自動生成
  • In order for us to see something, it either needs to emit light directly (like the sun

    為了讓我們看到某樣東西,它需要直接發出光(比如太陽)。

  • or a lightbulb filament or firefly) or else have photons of light bounce off of it and

    或燈泡燈絲或螢火蟲),否則有光子從它身上反彈,然後

  • into our eyes.

    映入我們的眼簾。

  • But how do we see light itself? You can't bounce light off of light (just like you can't

    但我們如何看到光本身呢?你不能把光從光中反射出來(就像你不能'。

  • bounce slinky waves or ripples in the water off of each other - they just pass right through!),

    在水面上彈起溜溜的波浪或漣漪--它們只是直接通過!)。)

  • plus, if you "look" at a photon of light in the normal everyday way, that means your eye

    另外,如果你用正常的日常方式看一個光子,那就意味著你的目

  • or camera or photodetector will absorb it - and then it's gone. Destroyed! Annihilated!

    或相機或光電探測器將吸收它 - 然後它'的消失。毀滅!消滅了!

  • It's like if you want to test how much weight a bridge can support before it falls down

    就像你想測試一座橋在倒塌前能承受多少重量一樣......。

  • once you've done your measurement, you have the information you wanted but you no longer

    一旦你'已經做了你的測量,你有你想要的資訊,但你不再

  • have a bridge.

    有一座橋。

  • So in order to "see" light, we need to use non-destructive testing.

    所以為了"見光,我們需要使用無損檢測。

  • One way of doing that is to make a super dark, super cold box and cover the inside with a

    一種方法是做一個超暗超冷的盒子,然後在裡面蓋上一個。

  • really really shiny mirror - a mirror so excellently reflective that photons of light bounce back

    真真切切的鏡子--一面反射性極強的鏡子,以至於光子都能反射回來。

  • and forth more than a BILLION times before being absorbed. In that time, they'll travel

    在被吸收之前,來來回回超過十億次。在這段時間裡,他們將旅行'。

  • a distance equivalent to one trip around earth.

    相當於繞地球一圈的距離。

  • This box is also so cold and dark that only occasionally will there even be one photon

    這個盒子也是如此的冷酷和黑暗,甚至只有偶爾才會有一個光子

  • inside. And if there is one, how do we tell without destroying it?

    內部。如果有的話,我們如何在不破壞它的情況下判斷呢?

  • Well, we send an atom through the box, an atom in a superposition of two different atomic

    我們把一個原子送進盒子裡 兩個不同的原子疊加起來的原子...

  • states, just like Schrödinger's cat! If there's no photon inside the mirror box, then when

    態,就像薛定諤的貓一樣!如果鏡箱內沒有光子,那麼當

  • the atom comes out the other side, we'll most likely measure it as being in a certain one

    原子從另一邊出來,我們很可能會把它測量成在某一個。

  • of the states - let's call it "dead". But if there is a photon in there, and we carefully

    的狀態--我們把它叫做"死"。但是,如果有一個光子在那裡,而我們小心翼翼地。

  • send the atom through so it doesn't actually destroy the photon, the atom-photon interactions

    送原子通過,所以它不會真正破壞光子,原子-光子的相互作用。

  • changes the odds - so now it's an overwhelming chance that we see that atom as "alive." After

    改變了機率--所以現在它'是一個壓倒性的機會,我們把那個原子看成是"活著的"之後。

  • sending through a few atoms, if they're mainly in the "alive" state, then we know there's

    發送通過幾個原子,如果他們'主要是在"活著"狀態,那麼我們知道有'的。

  • a photon in the box! And if they're "dead": no photon.

    盒子裡的光子!如果他們'死了"。如果他們'是"死了":沒有光子。

  • It's kind of like sending a pinwheel through a dark chamber, and if it comes out the other

    這有點像發送一個風車 通過一個黑暗的房間, 如果它出來的另一個。

  • side spinning, you know the wind is blowing. If not? No wind.

    邊旋轉,你就知道風在吹。如果沒有呢?沒有風。

  • In fact, once we know there's a photon in there, we can use this cat measurement technique

    事實上,一旦我們知道里面有'光子,我們就可以使用這種貓咪測量技術了

  • to measure and manipulate other things about the photon: we can see how long it bounces

    來測量和處理光子的其他事情:我們可以看到它的彈跳時間。

  • back and forth before it gets absorbed, check if it's in a superposition and even force

    在它被吸收之前來回走動,檢查它是否處於疊加狀態,甚至強行

  • it into a superposition like Schrödinger's cat itself - so, not only can we see light,

    它變成了像薛定諤'的貓本身那樣的疊加--所以,我們不僅可以看到光。

  • we can now use Schrödinger's cat to measure Schrödinger's cat: Quantum Catception!

    我們現在可以用薛定諤'的貓來測量薛定諤'的貓。Quantum Catception!

In order for us to see something, it either needs to emit light directly (like the sun

為了讓我們看到某樣東西,它需要直接發出光(比如太陽)。

字幕與單字
由 AI 自動生成

單字即點即查 點擊單字可以查詢單字解釋

B1 中級 中文 光子 原子 盒子 吸收 狀態 發送

2012諾貝爾獎,我們如何看到光(2012 Nobel Prize: How Do We See Light?)

  • 122 13
    Why Why 發佈於 2013 年 03 月 28 日
影片單字