Experimental quantum teleportation

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Abstract

Quantum teleportation -- the transmission and reconstruction over arbitrary distances of the state of a quantum system -- is demonstrated experimentally. During teleportation, an initial photon which carries the polarization that is to be transferred and one of a pair of entangled photons are subjected to a measurement such that the second photon of the entangled pair acquires the polarization of the initial photon. This latter photon can be arbitrarily far away from the initial one. Quantum teleportation will be a critical ingredient for quantum computation networks.

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Die gegenw�rtige Situation in der Quantenmechanik

E. Schr�dinger (1935)

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Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels

John Smolin, Benjamin Schumacher, Sandu Popescu … (1995)

Two separated observers, by applying local operations to a supply of not-too-impure entangled states ({\em e.g.} singlets shared through a noisy channel), can prepare a smaller number of entangled pairs of arbitrarily high purity ({\em e.g.} near-perfect singlets). These can then be used to faithfully teleport unknown quantum states from one observer to the other, thereby achieving faithful transfrom one observer to the other, thereby achieving faithful transmission of quantum information through a noisy channel. We give upper and lower bounds on the yield \(D(M)\) of pure singlets (\(\ket{\Psi^-}\)) distillable from mixed states \(M\), showing \(D(M)>0\) if \(\bra{\Psi^-}M\ket{\Psi^-}>\half\).