2. PRESENTED BY MIDHUN.T - EC 3 - S 61 TOPIC – QUANTUM TELEPORTATION Presented by - MIDHUN T EC 3, S 6 ROLL NO. 20 Reg no. 89200156

3. PRESENTED BY MIDHUN.T - EC 3 - S 62 What is teleportation? A hypothetical method of transportation in which matter or information is dematerialized, usually instantaneously, at one point and recreated at another...

4. Roughly speaking, there is a Lab A and a Lab B, and each lab has a box. The goal of teleportation is to take any object that is placed in Box A and move it to Box B… PRESENTED BY MIDHUN.T - EC 3 - S 63 Roughly speaking, there is a Lab A and a Lab B, and each lab has a box. The goal of teleportation is to take any object that is placed in Box A and move it to Box B… BOX A BOX B

5. PRESENTED BY MIDHUN.T - EC 3 - S 64 LET’S DIVIDE TELEPORTATION IN TO TWO… CLASSICAL TELEPORTATION QUANTUM TELEPORTATION

6. PRESENTED BY MIDHUN.T - EC 3 - S 65 CLASSICAL TELEPORTATION

7. PRESENTED BY MIDHUN.T - EC 3 - S 66 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.

8. PRESENTED BY MIDHUN.T - EC 3 - S 67 BUT THIS WAS PROVED IMPOSSIBLE DUE TO TWO REASONS:- 1) Heisenberg uncertainty principle:

9. PRESENTED BY MIDHUN.T - EC 3 - S 68 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……

10. PRESENTED BY MIDHUN.T - EC 3 - S 69 QUANTUM TELEPORTATION

11. PRESENTED BY MIDHUN.T - EC 3 - S 610 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%physicsmatterenergy of the speed of light is possible but very hard to do.

12. PRESENTED BY MIDHUN.T - EC 3 - S 611 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.

13. PRESENTED BY MIDHUN.T - EC 3 - S 612 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………

14. PRESENTED BY MIDHUN.T - EC 3 - S 613

15. PRESENTED BY MIDHUN.T - EC 3 - S 614 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 Nature 390 (1997) 575-579

16. PATENT ON TELEPORTATION PRESENTED BY MIDHUN.T - EC 3 - S 615

17. SUMMARY PRESENTED BY MIDHUN.T - EC 3 - S 616 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…… @

18. PRESENTED BY MIDHUN.T - EC 3 - S 617 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. THANK YOU…………