Will we ever be able to teleport? - Sajan Saini

3,165,036 views ・ 2017-07-31

TED-Ed


μ•„λž˜ μ˜λ¬Έμžλ§‰μ„ λ”λΈ”ν΄λ¦­ν•˜μ‹œλ©΄ μ˜μƒμ΄ μž¬μƒλ©λ‹ˆλ‹€.

λ²ˆμ—­: juhyeon park κ²€ν† : Won Jang
00:07
Is teleportation possible?
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μˆœκ°„ 이동이 κ°€λŠ₯ν• κΉŒμš”?
00:09
Could a baseball transform into something like a radio wave,
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야ꡬ곡이 마치 μ „νŒŒμ™€ 같은 ν˜•νƒœλ‘œ λ³€ν˜•λœ ν›„
00:13
travel through buildings,
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건물 속을 ν†΅κ³Όν•˜κ³ 
00:14
bounce around corners,
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λͺ¨ν‰μ΄λ₯Ό λŒμ•„
00:16
and change back into a baseball?
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μ•Όκ΅¬κ³΅μœΌλ‘œ λ‹€μ‹œ λ°”λ€ŒλŠ” 게 κ°€λŠ₯ν• κΉŒμš”?
00:18
Oddly enough, thanks to quantum mechanics, the answer might actually be yes.
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말이 μ•ˆλ˜λŠ” 것 κ°™μ§€λ§Œ, μ–‘μžμ—­ν•™ 덕뢄에 이에 λŒ€ν•œ λŒ€λ‹΅μ€ β€˜κ·Έλ ‡λ‹€β€™ μž…λ‹ˆλ‹€.
00:24
Sort of.
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λΉ„μŠ·ν•˜κ²ŒλŠ” κ°€λŠ₯ν•΄μš”.
00:26
Here's the trick.
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비결을 μ•Œλ €λ“œλ¦¬μ£ .
00:27
The baseball itself couldn't be sent by radio,
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야ꡬ곡 κ·Έ μžμ²΄λŠ” μ „νŒŒλ‘œ 보낼 수 μ—†μ§€λ§Œ
00:30
but all the information about it could.
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κ·Έ 곡에 λŒ€ν•œ λͺ¨λ“  μ •λ³΄λŠ” 보낼 수 μžˆμŠ΅λ‹ˆλ‹€.
00:33
In quantum physics, atoms and electrons
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μ–‘μžλ¬Όλ¦¬ν•™μ—μ„œ μ›μžλ“€κ³Ό μ „μžλ“€μ€
00:36
are interpreted as a collection of distinct properties,
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λˆˆμ— λ„λŠ” μ—¬λŸ¬ μ„±μ§ˆλ“€μ˜ μ‘°ν•©μœΌλ‘œ 해석 λ©λ‹ˆλ‹€.
00:39
for example, position,
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예λ₯Ό λ“€λ©΄, μœ„μΉ˜
μš΄λ™λŸ‰
00:41
momentum,
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00:41
and intrinsic spin.
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고유 μŠ€ν•€ 같은 μ„±μ§ˆμž…λ‹ˆλ‹€.
00:44
The values of these properties configure the particle,
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μ΄λŸ¬ν•œ μ„±μ§ˆλ“€μ— λŒ€ν•œ 값이 μž…μžλ“€μ— νŠΉμ„±μ„ λΆ€μ—¬ν•˜κ³ 
00:47
giving it a quantum state identity.
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μ–‘μžμƒνƒœμ˜ νŠΉμ„±μ„ κ²°μ •ν•©λ‹ˆλ‹€.
00:50
If two electrons have the same quantum state,
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두 개의 μ „μžκ°€ 같은 μ–‘μž μƒνƒœλ₯Ό κ°–κ³  μžˆλŠ” 경우
00:52
they're identical.
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그듀은 λ™μΌν•˜λ‹€κ³  μ—¬κ²¨μ§‘λ‹ˆλ‹€.
00:54
In a literal sense, our baseball is defined by a collective quantum state
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이런 λ§₯락으둜 보면 야ꡬ곡은 곡을 κ΅¬μ„±ν•˜λŠ” λ§Žμ€ μ›μžλ“€μ΄ μ΄λ£¨λŠ”
00:59
resulting from its many atoms.
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ν•˜λ‚˜μ˜ μ–‘μž μƒνƒœλ‘œ μ •μ˜λ  수 있죠.
01:01
If this quantum state information could be read in Boston
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λ§Œμ•½, 이 μ–‘μž μƒνƒœμ— λŒ€ν•œ 정보λ₯Ό λ³΄μŠ€ν„΄μ—μ„œ κΈ°λ‘ν•œ 뒀에
01:05
and sent around the world,
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μ „ μ„Έκ³„λ‘œ 보내면
01:07
atoms for the same chemical elements could have this information
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λ™μΌν•œ μ›μ†Œλ₯Ό μ΄λ£¨λŠ” μ›μžλ“€μ— 이 정보듀을 μž…λ ₯ν•˜λŠ” μž‘μ—…μ„
01:10
imprinted on them in Bangalore
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방갈둜λ₯΄μ—μ„œ ν•œ λ‹€μŒμ—
01:13
and be carefully directed to assemble,
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이 μ›μžλ“€μ„ μ‘°μ‹¬μŠ€λŸ½κ²Œ μ‘°λ¦½ν•˜λ©΄
01:16
becoming the exact same baseball.
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μ™„μ „ν•˜κ²Œ λ™μΌν•œ 야ꡬ곡을 λ§Œλ“€ μˆ˜λ„ μžˆμŠ΅λ‹ˆλ‹€.
01:18
There's a wrinkle though.
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그런데 ν•œ 가지 λ¬Έμ œκ°€ 있죠.
01:20
Quantum states aren't so easy to measure.
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μ–‘μž μƒνƒœλŠ” μΈ‘μ •ν•˜κΈ°κ°€ 쉽지 μ•ŠμŠ΅λ‹ˆλ‹€.
01:22
The uncertainty principle in quantum physics
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μ–‘μžλ¬Όλ¦¬ν•™μ—μ„œ μ–ΈκΈ‰λ˜λŠ” λΆˆμ•ˆμ •μ„±μ˜ 원리에 λ”°λ₯΄λ©΄
01:25
implies the position and momentum of a particle
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μ–΄λ–€ μž…μžμ˜ μœ„μΉ˜μ™€ μš΄λ™λŸ‰μ€
01:28
can't be measured at the same time.
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λ™μ‹œμ— μΈ‘μ •ν•  수 μ—†μŠ΅λ‹ˆλ‹€.
01:31
The simplest way to measure the exact position of an electron
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μ „μžμ˜ μ •ν™•ν•œ μœ„μΉ˜λ₯Ό μΈ‘μ •ν•˜λŠ” κ°€μž₯ κ°„λ‹¨ν•œ 방법은
01:34
requires scattering a particle of light, a photon, from it,
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κ΄‘μžλΌ λΆˆλ¦¬λŠ” λΉ›μ˜ μž…μžλ₯Ό μ „μžμ—μ„œ νŠ€μ–΄λ‚˜μ˜€κ²Œ ν•œ λ‹€μŒ
01:39
and collecting the light in a microscope.
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ν˜„λ―Έκ²½μ„ ν†΅ν•΄μ„œ κ·Έ 빛을 νšŒμˆ˜ν•˜λŠ” 것 μž…λ‹ˆλ‹€.
01:41
But that scattering changes the momentum of the electron in an unpredictable way.
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ν•˜μ§€λ§Œ κ΄‘μžλ₯Ό νŠ•κ²¨λ‚΄λŠ” 과정이 μ „μžμ˜ μš΄λ™λŸ‰μ„ 예츑 λΆˆκ°€λŠ₯ν•˜κ²Œ λ°”κΎΈκ³ 
01:47
We lose all previous information about momentum.
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이미 μ•Œκ³  있던 μš΄λ™λŸ‰ 정보가 λͺ¨λ‘ μ†μ‹€λ˜μ–΄ λ²„λ¦½λ‹ˆλ‹€.
01:50
In a sense, quantum information is fragile.
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이처럼, μ–‘μž μƒνƒœμ˜ μ •λ³΄λŠ” λ„ˆλ¬΄λ‚˜ λ―Όκ°ν•΄μ„œ
01:53
Measuring the information changes it.
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κ·Έ 정보λ₯Ό μΈ‘μ •ν•˜λŠ” κ²ƒλ§ŒμœΌλ‘œλ„ 정보가 λ°”λ€Œμ–΄ λ²„λ¦½λ‹ˆλ‹€.
01:55
So how can we transmit something
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κ·Έλ ‡λ‹€λ©΄ ν›Όμ†μ‹œν‚€μ§€ μ•Šκ³ λŠ” 읽을 μˆ˜λ„ μ—†λŠ” 것을
01:57
we're not permitted to fully read without destroying it?
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μ–΄λ–»κ²Œ 전솑할 수 μžˆμ„κΉŒμš”?
02:01
The answer can be found in the strange phenomena of quantum entanglement.
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κ·Έ 정닡은 μ–‘μžμ–½νž˜μ΄λΌλŠ” μ‹ κΈ°ν•œ ν˜„μƒμ—μ„œ 찾을 수 μžˆμŠ΅λ‹ˆλ‹€.
02:06
Entanglement is an old mystery from the early days of quantum physics
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μ–‘μžμ–½νž˜μ€ μ–‘μžλ¬Όλ¦¬ν•™μ˜ μ΄ˆμ°½κΈ°λΆ€ν„° κ³„μ†λ˜μ–΄ 온 였래된 λ―ΈμŠ€ν…Œλ¦¬λ‘œμ„œ
02:10
and it's still not entirely understood.
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아직도 μ™„μ „νžˆ λ°ν˜€λ‚΄μ§€ λͺ»ν–ˆμŠ΅λ‹ˆλ‹€.
02:13
Entangling the spin of two electrons results in an influence
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두 μ „μžμ˜ μŠ€ν•€μ„ μ–½νžˆκ²Œ λ§Œλ“€λ©΄
거리가 λ–¨μ–΄μ Έ μžˆμ–΄λ„ μ„œλ‘œ 영ν–₯을 λ―ΈμΉ©λ‹ˆλ‹€.
02:17
that transcends distance.
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02:19
Measuring the spin of the first electron
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κ·Έ 쀑 ν•˜λ‚˜μ˜ μ „μžμ˜ μŠ€ν•€μ„ μΈ‘μ •ν•˜λ©΄
02:21
determines what spin will measure for the second,
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λ‚˜λ¨Έμ§€ ν•œ μ „μžμ˜ μŠ€ν•€ λ˜ν•œ μ•Œ 수 있게 λ©λ‹ˆλ‹€.
02:24
whether the two particles are a mile or a light year apart.
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이 두 μ „μžκ°€ 1마일 λ–¨μ–΄μ Έ μžˆλ“  1κ΄‘λ…„ λ–¨μ–΄μ Έ μžˆλ“  μƒκ΄€μ—†μŠ΅λ‹ˆλ‹€.
02:29
Somehow, information about the first electron's quantum state,
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데이터 큐빗이라고 λΆˆλ¦¬λŠ” 첫 번째 μ „μžμ˜ μ–‘μž μƒνƒœμ— λŒ€ν•œ μ •λ³΄λŠ”
02:32
called a qubit of data,
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02:34
influences its partner without transmission across the intervening space.
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곡간 λ„ˆλ¨Έλ‘œμ˜ 전솑 없이도 μƒλŒ€ μ „μžμ— 영ν–₯을 μ€λ‹ˆλ‹€.
02:40
Einstein and his colleagues called this strange communcation
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μ•„μΈμŠˆνƒ€μΈκ³Ό 그의 λ™λ£Œλ“€μ€ 이 μ‹ λΉ„λ‘œμš΄ μ˜μ‚¬ μ†Œν†΅μ„
02:43
spooky action at a distance.
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μ›κ²©μ—μ„œ μΌμ–΄λ‚˜λŠ” μ†Œλ¦„ λ‹λŠ” ν˜„μƒμ΄λΌκ³  λΆˆλ €μŠ΅λ‹ˆλ‹€.
02:46
While it does seem that entanglement between two particles
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두 μž…μž κ°„μ˜ μ–½νž˜ ν˜„μƒμœΌλ‘œ
02:50
helps transfer a qubit instantaneously across the space between them,
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λ‘˜ μ‚¬μ΄μ˜ 곡간 λ„ˆλ¨Έλ‘œ 큐빗을 μˆœμ‹κ°„μ— 전솑할 수 μžˆμ„ 것 κ°™μ§€λ§Œ
02:54
there's a catch.
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μ—¬κΈ°μ—λŠ” λ¬Έμ œκ°€ μžˆμŠ΅λ‹ˆλ‹€.
02:56
This interaction must begin locally.
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μ΄λŸ¬ν•œ μƒν˜Έμž‘μš©μ€ κ°€κΉŒμ΄μ—μ„œ μ‹œμž‘λ˜μ–΄μ•Ό ν•œλ‹€λŠ” κ²ƒμ΄μ§€μš”.
03:00
The two electrons must be entangled in close proximity
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두 개의 μ „μžλ“€μ΄ κ°€κΉŒμ΄μ—μ„œ λ¨Όμ € μ–½ν˜€ μžˆμ–΄μ•Όλ§Œ
03:03
before one of them is transported to a new site.
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λ‘˜ 쀑 ν•œ μ „μžλ₯Ό μƒˆλ‘œμš΄ μž₯μ†Œλ‘œ μ΄λ™μ‹œν‚¬ 수 μžˆμŠ΅λ‹ˆλ‹€.
03:08
By itself, quantum entanglement isn't teleportation.
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μ–‘μžμ–½νž˜ μžμ²΄λ§ŒμœΌλ‘œλŠ” μˆœκ°„μ΄λ™μ„ μ™„μ„±ν•˜κΈ°μ— λΆ€μ‘±ν•˜μ£ .
03:11
To complete the teleport,
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μˆœκ°„μ΄λ™μ„ μ™„μ„±ν•˜λ €λ©΄
03:13
we need a digital message to help interpret the qubit at the receiving end.
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μˆ˜μ‹  μž₯μ†Œμ—μ„œμ˜ 큐빗 해석에 ν•„μš”ν•œ 디지털 데이터가 ν•„μš”ν•©λ‹ˆλ‹€.
03:18
Two bits of data created by measuring the first particle.
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λ°”λ‘œ 첫 번째 μž…μžλ₯Ό μΈ‘μ • ν•  λ•Œ λ§Œλ“€μ–΄μ§„ 2 λΉ„νŠΈμ˜ λ°μ΄ν„°μž…λ‹ˆλ‹€.
03:22
These digital bits must be transmitted by a classical channel
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μ΄λŸ¬ν•œ 디지털 λΉ„νŠΈλŠ” 기쑴의 전톡적인 맀체λ₯Ό ν†΅ν•΄μ„œ μ „λ‹¬λ˜λŠ”λ°
03:26
that's limited by the speed of light, radio, microwaves, or perhaps fiberoptics.
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이 λ•Œμ—λŠ” λΉ›, μ „νŒŒ, μ „μžνŒŒ ν˜Ήμ€ κ΄‘μ„¬μœ μ— μ˜ν•œ 속도적 μ œμ•½μ΄ μƒκΉλ‹ˆλ‹€.
03:32
When we measure a particle for this digital message,
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이런 디지털 데이터λ₯Ό μ–»κΈ° μœ„ν•΄μ„œ μ–΄λ–€ μž…μžλ₯Ό μΈ‘μ •ν•˜λ € 되면
03:34
we destroy its quantum information,
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κ·Έ μž…μžμ˜ μ–‘μž μ •λ³΄λŠ” νŒŒκ΄΄λ©λ‹ˆλ‹€.
03:37
which means the baseball must disappear from Boston
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λ”°λΌμ„œ λ³΄μŠ€ν†€μ—μ„œ 야ꡬ곡이 μ‚¬λΌμ Έμ•Όλ§Œ
03:40
for it to teleport to Bangalore.
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방갈둜λ₯΄λ‘œ μˆœκ°„μ΄λ™ν•  수 μžˆμ§€μš”.
03:42
Thanks to the uncertainty principle,
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λΆˆν™•μ •μ„±μ˜ 원리 덕뢄에
03:44
teleportation transfers the information about the baseball
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μˆœκ°„μ΄λ™μœΌλ‘œ 야ꡬ곡에 λŒ€ν•œ 정보λ₯Ό λ‹€λ₯Έ λ„μ‹œλ‘œ 전달할 μˆ˜λŠ” μžˆμ§€λ§Œ
03:48
between the two cities and never duplicates it.
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그것을 λ³΅μ œν•˜λŠ” 것은 λΆˆκ°€λŠ₯ν•©λ‹ˆλ‹€.
03:52
So in principle, we could teleport objects, even people,
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λ”°λΌμ„œ μ΄λ‘ μ μœΌλ‘œλŠ” λ¬Όμ²΄λ‚˜ 심지어 μ‚¬λžŒμ„ μˆœκ°„ μ΄λ™μ‹œν‚¬ 수 μžˆμ§€λ§Œ
03:56
but at present, it seems unlikely we can measure the quantum states
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ν˜„μž¬λ‘œμ„œλŠ” 큰 물체λ₯Ό κ΅¬μ„±ν•˜λŠ” μˆ˜μ–΅ μ‘° 개 μ΄μƒμ˜ μ›μžλ“€μ˜
04:00
of the trillion trillion or more atoms in large objects
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μ–‘μžμƒνƒœλ₯Ό μΈ‘μ •ν•˜λŠ”κ²ƒμ€ λΆˆκ°€λŠ₯ν•΄ 보이며
04:04
and then recreate them elsewhere.
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λ‹€λ₯Έ κ³³μ—μ„œ κ·Έ 물체λ₯Ό μž¬κ΅¬μ„±ν•˜λŠ”κ²ƒλ„ νž˜λ“­λ‹ˆλ‹€.
04:06
The complexity of this task and the energy needed is astronomical.
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이 μž‘μ—…μ— λ“€μ–΄κ°€λŠ” μ—λ„ˆμ§€μ™€ κ·Έ λ³΅μž‘μ„±μ€ μ²œλ¬Έν•™μ μž…λ‹ˆλ‹€.
04:11
For now, we can reliably teleport single electrons and atoms,
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ν˜„μž¬ μš°λ¦¬λŠ” 단 ν•˜λ‚˜μ˜ μ „μžμ™€ μ›μžλ₯Ό μ•ˆμ •μ μœΌλ‘œ μˆœκ°„μ΄λ™μ‹œν‚¬ 수 있으며
04:15
which may lead to super-secured data encryption
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덕뢄에 미래의 μ–‘μžμ»΄ν“¨ν„°λ“€μ€
04:17
for future quantum computers.
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κ·Ήλ„λ‘œ μ•ˆμ „ν•˜κ²Œ 데이터λ₯Ό μ•”ν˜Έν™”μ‹œν‚¬ 수 μžˆμ„ 것 μž…λ‹ˆλ‹€.
04:21
The philosophical implications of quantum teleportation are subtle.
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μ–‘μž μˆœκ°„μ΄λ™μ˜ 철학적인 μ˜λ―ΈλŠ” λ―Έλ¬˜ν•©λ‹ˆλ‹€.
04:25
A teleported object doesn't exactly transport across space
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μˆœκ°„μ΄λ™λœ λ¬Όμ²΄λŠ”
곡간 λ„ˆλ¨Έλ‘œ μœ ν˜•μ˜ 물질이 μ‹€μ œλ‘œ μ΄λ™ν•˜λŠ” 것이 μ•„λ‹ˆκ³ 
04:29
like tangible matter,
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04:31
nor does it exactly transmit across space, like intangible information.
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λ¬΄ν˜•μ˜ 정보가 곡간을 λ„ˆλ¨Έ μ „μ†‘λ˜λŠ” 것도 μ•„λ‹™λ‹ˆλ‹€.
04:36
It seems to do a little of both.
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이 λ‘˜μ˜ 쀑간이라고 ν•  수 있죠.
04:38
Quantum physics gives us a strange new vision
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μ–‘μž 물리학은 μš°λ¦¬μ—κ²Œ μƒˆλ‘œμš΄ μ‹œκ°μ„ μ œμ‹œν•˜μ—¬
04:41
for all the matter in our universe as collections of fragile information.
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우주λ₯Ό ν•˜λ‚˜μ˜ μ·¨μ•½ν•œ μ •λ³΄λ“€μ˜ λ©μ–΄λ¦¬λ‘œ 보게 ν•©λ‹ˆλ‹€.
04:45
And quantum teleportation reveals new ways to influence this fragility.
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그리고 μ–‘μžμ΄λ™μ€ 이런 취약성에 영ν–₯을 μ£ΌλŠ” μƒˆλ‘œμš΄ 방법을 μ œμ‹œν•©λ‹ˆλ‹€.
04:51
And remember, never say never.
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그리고 κΈ°μ–΅ν•΄λ‘μ„Έμš”, μ ˆλŒ€ λΆˆκ°€λŠ₯은 μ—†μŠ΅λ‹ˆλ‹€.
04:53
In a little over a century,
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100년이 쑰금 λ„˜λŠ” μ‹œκ°„ λ™μ•ˆ
04:55
mankind has advanced from an uncertain new understanding
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인λ₯˜λŠ” μ›μž λ‹¨μœ„μ—μ„œ μ „μžμ˜ μ›€μ§μž„μ„
04:59
of the behavior of electrons at the atomic scale
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μƒˆλ‘­κ²Œ μ΄ν•΄ν•˜λŠ” κ²ƒμ—μ„œ μΆœλ°œν•˜μ—¬
05:01
to reliably teleporting them across a room.
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λ‹€λ₯Έ 곳으둜 μ „μžλ₯Ό μ•ˆμ •μ μœΌλ‘œ μˆœκ°„μ΄λ™ μ‹œν‚€λŠ” λ°κΉŒμ§€ λ°œμ „ν–ˆμŠ΅λ‹ˆλ‹€.
05:06
What new technical mastery of such phenomena
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1,000λ…„ ν˜Ήμ€ 10,000λ…„ ν›„μ—λŠ”
05:09
might we have in 1,000, or even 10,000 years?
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이런 ν˜„μƒλ“€μ— λŒ€ν•΄μ„œ μ–΄λ–€ μƒˆλ‘œμš΄ κΈ°μˆ μ„ μ•Œκ²Œ λ κΉŒμš”?
05:12
Only time and space will tell.
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였직 μ‹œκ°„κ³Ό κ³΅κ°„λ§Œ μ•Œκ² μ§€μš”.
이 μ›Ήμ‚¬μ΄νŠΈ 정보

이 μ‚¬μ΄νŠΈλŠ” μ˜μ–΄ ν•™μŠ΅μ— μœ μš©ν•œ YouTube λ™μ˜μƒμ„ μ†Œκ°œν•©λ‹ˆλ‹€. μ „ 세계 졜고의 μ„ μƒλ‹˜λ“€μ΄ κ°€λ₯΄μΉ˜λŠ” μ˜μ–΄ μˆ˜μ—…μ„ 보게 될 κ²ƒμž…λ‹ˆλ‹€. 각 λ™μ˜μƒ νŽ˜μ΄μ§€μ— ν‘œμ‹œλ˜λŠ” μ˜μ–΄ μžλ§‰μ„ 더블 ν΄λ¦­ν•˜λ©΄ κ·Έκ³³μ—μ„œ λ™μ˜μƒμ΄ μž¬μƒλ©λ‹ˆλ‹€. λΉ„λ””μ˜€ μž¬μƒμ— 맞좰 μžλ§‰μ΄ μŠ€ν¬λ‘€λ©λ‹ˆλ‹€. μ˜κ²¬μ΄λ‚˜ μš”μ²­μ΄ μžˆλŠ” 경우 이 문의 양식을 μ‚¬μš©ν•˜μ—¬ λ¬Έμ˜ν•˜μ‹­μ‹œμ˜€.

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