Name: 【TED-Ed】Will we ever be able to teleport? - Sajan Saini
Uploaded: 2017-08-01T14:48:30.000Z
Duration: 5 min 38 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Could a baseball transform into something like a radio wave,

Oddly enough, thanks to quantum mechanics, the answer might actually be yes.

The baseball itself couldn't  be sent by radio,

are interpreted as a collection of distinct properties,

The values of these properties configure the particle,

If two electrons have  the same quantum state,

In a literal sense, our baseball is defined by a collective quantum state

If this quantum state information could be read in Boston

atoms for the same chemical elements could have this information

Quantum states aren't so easy to measure.

The uncertainty principle in quantum physics

implies the position and momentum of a particle

The simplest way to measure the exact position of an electron

requires scattering a particle of light, a photon, from it,

and collecting the light in a microscope.

But that scattering changes the momentum of the electron in an unpredictable way.

We lose all previous information about momentum.

In a sense, quantum information is fragile.

we're not permitted to fully read without destroying it?

The answer can be found in the strange phenomena of quantum entanglement.

Entanglement is an old mystery from the early days of quantum physics

Entangling the spin of two electrons results in an influence

determines what spin will measure for the second,

whether the two particles are a mile or a light year apart.

Somehow, information about the first electron's quantum state,

influences its partner without transmission across the intervening space.

Einstein and his colleagues called this strange communcation

While it does seem that entanglement between two particles

helps transfer a qubit instantaneously across the space between them,

The two electrons must be entangled in close proximity

before one of them is transported to a new site.

By itself, quantum entanglement isn't teleportation.

we need a digital message to help interpret the qubit at the receiving end.

Two bits of data created by measuring the first particle.

These digital bits must be transmitted by a classical channel

that's limited by the speed of light, radio, microwaves, or perhaps fiberoptics.

When we measure a particle for this digital message,

which means the baseball must disappear from Boston

teleportation transfers the information about the baseball

between the two cities and never duplicates it.

So in principle, we could teleport objects, even people,

but at present, it seems unlikely we can measure the quantum states

of the trillion trillion or more atoms in large objects

The complexity of this task and the energy needed is astronomical.

For now, we can reliably teleport single electrons and atoms,

which may lead to super-secured data encryption

The philosophical implications of quantum teleportation are subtle.

A teleported object doesn't exactly transport across space

nor does it exactly transmit across space, like intangible information.

Quantum physics gives us a strange new vision

for all the matter in our universe as collections of fragile information.

And quantum teleportation reveals new ways to influence this fragility.

mankind has advanced from an uncertain new understanding

of the behavior of electrons at the atomic scale

to reliably teleporting them across a room.

What new technical mastery of such phenomena

might we have in 1,000, or even 10,000 years?

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【TED-Ed】Will we ever be able to teleport? - Sajan Saini

subtle

trick

reveal

matter