Entanglement and quantum teleportation of simple macroscopic objects
Green College Coach House - March 17, 2003

Eugene Polzik

University of Aarhus, Denmark

Entanglement links two quantum objects together in such a way that each of them lacks a definite "quantum state". Such a link opens completely new possibilities for communication, secret coding and computing. In principle, entanglement exists in any complex object around us, where it appears and disappears in an uncontrolled way. Moreover, the larger an object, the shorter the lifetime of its entanglement with the rest of the world. Unlike this "natural" entanglement, useful "engineered" entanglement should possess special properties. For instance, for quantum communication or teleportation purposes the entanglement must be generated between distant objects and has to be maintained for long enough time. Recently such entanglement between two clouds of Cesium atoms containing billions of atoms each has been demonstrated experimentally. Since entanglement has been generated by light pulses traversing the two clouds, this approach allows, in principle, the entanglement of very distant objects. The reasons why billions of atoms can stay entangled and the possible applications for quantum information processing will be discussed.

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