TOPIC – QUANTUM TELEPORTATION
Presented by -
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MIDHUN T
EC 3 , S 6
ROLL NO. 20
Reg no. 89200156
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What is teleportation?
A hypothetical method of transportation in which
matter or information is dematerialized, usually
instantaneously, at one point and recreated at another...
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Roughly speaking, there is a Lab A and a Lab B, and each lab has a box. The goal of
Roughly speaking,
there
a Labthat
A and
a Lab B,inand
labmove
has aitbox.
TheB…
goal of
teleportation
is to take
anyisobject
is placed
Boxeach
A and
to Box
teleportation is to take any object that is placed in Box A and move it to Box B…
BOX A
BOX B
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LET’S DIVIDE TELEPORTATION IN TO TWO…
CLASSICAL TELEPORTATION
QUANTUM TELEPORTATION
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CLASSICAL TELEPORTATION
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According to classical teleportation , teleportation
can be done by………..
@
@
@
@
Measure the state of the input
Transmit the results
Destroy the original copy
Reconstruct the original from the received
description.
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BUT THIS WAS PROVED IMPOSSIBLE DUE TO TWO REASONS:1) Heisenberg uncertainty principle:
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The uncertainty principle says, for instance, that it is impossible to
measure a particle's velocity in any moment and then have any hope
of measuring its location for that moment
2) It appears that before running the object or body
through the shredder the measurement process will likely
destroy the only good copy without obtaining the required
information to rebuilt……
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QUANTUM TELEPORTATION
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The surprising result of teleportation is that even though the
"measure and reconstruct" procedure does not work, there
is an alternative procedure that effectively realizes
teleportation in the quantum world .In fact, it was not until
the publication of a 1993 paper by Bennett, Brassard,
Crepeau, Jozsa, Peres and Wootters that we realized
quantum teleportation was possible. That is some 70 years
after the formulation of the theory of quantum mechanics!
(Quantum mechanics, also known as quantum physics or quantum theory, is a
branch of physics providing a mathematical description of the dual particle-like and
wave-like behavior and interaction of matter and energy.)Effectively
we
realized that quantum teleportation, which we thought to
be impossible, is only very very hard. What is the difference
between the two notions? Traveling faster than the speed of
light is impossible, traveling at say 99%
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of the speed of light is possible
but- ECvery
hard to do.
Our setup for quantum teleportation is equal to the
one for classical teleportation. But there is one
important difference. In the quantum case, Labs A
and B must begin with something called an
entangled quantum state, which will be destroyed by
the teleportation procedure.
Roughly speaking an entangled state is a pair of
objects that are correlated in a quantum way.
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REAL EXPERIMENTS AND DEVELOPMENT IN
TELEPORTATION
A number of groups conducted experimental realizations
of the quantum teleportation procedure using a variety
of different systems such as the spin (or polarization) of
photons and the spin of atoms…..
some experiments from 1993-2009 are………
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FIRST EXPERIMENT ON QUANTUM TELEPORTATION
First experimental verification of quantum
teleportation. producing pairs of
entangled photons by the process of
parametric down-conversion and using
two-photon interferometry for analysing
the entanglement, we could transfer a
quantum property (in our case the
polarization state) from one photon to
another. A pulse of UV-light passing
through a nonlinear crystal creates the
ancillary entangled pair of photons 2 and
3. After retroflection during its second
passage through the crystal the UV-pulse creates another pair of photons. One of these will be
the teleported photon 1. It can be prepared to have any polarization. Photon 4, deteced by
detector p, serves as a trigger to indicate that photon 1 is under way. ALICE then looks for
coincidences behind a beam splitter BS2 where photon 1 and the anciliaries are superposed.
BOB, after receiving the clasical information that ALICE obtained a coincidence count in
detectors f1 and f2 identifying the Bell state , knows that his photon 3 is in the initial state of
photon 1. This he can check using polarization analysis with the polarizing beam splitter PBS
and the detectors d1 and d2. Thus, photon 3 will turn out to have exactly the properties of
photon 1 as defined by the polarizer.
Experimental Quantum Teleportation
390 (1997) 575-579 14
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PATENT ON TELEPORTATION
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SUMMARY
SUMMARY
@TELEPORTATION-A hypothetical method of transportation in which matter or
information is dematerialized, usually instantaneously, at one point and recreated at
another...
@CLASSICAL TELEPORTATION WAS PROVED IMPOSSIBLE DUE TO TWO REASONS:1) Heisenberg uncertainty principle
2) Destruction of the original copy before measurements.
@The setup for quantum teleportation is equal to the one for classical teleportation.
But there is one important difference. In the quantum case, Labs A and B must
begin with something called an entangled quantum state, which will be destroyed
by the teleportation procedure.
@There have been many development in the experiments based on teleportation,
and these experiments may lead to a great change in the face of humans if it is a
success……
@
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Of course, the final answer to whether teleportation of people is possible even in
principle must wait for the formulation
of a complete theory of physics, one which unites relativity with quantum
mechanics.
In the meantime, one can ask if there any applications for teleporting thousands of
spins?
The answer is probably yes. In the future it is likely that quantum computers (i.e.,
computers capable of processing
quantum information) will be built and may even be as ubiquitous as classical
computers are today. These computers
will need to exchange quantum information. One way these exchanges of
information can occur is via a quantum
phone, that is, a device capable of sending and received quantum messages. But
when such phones are not available,
the alternative is to do teleportation using a regular phone. So don't be surprised if
some day in the next 100 years
you see a quantum teleportation device for sale in your local computer store.
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THANK YOU…………