A posteriori teleportation

Samuel L. Braunstein and H. J. Kimble
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Samuel L. Braunstein: SEECS, University of Wales
H. J. Kimble: Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena

Nature, 1998, vol. 394, issue 6696, 840-841

Abstract: Abstract The article by Bouwmeester et al.1 on experimental quantum teleportation constitutes an important advance in the burgeoning field of quantum information. The experiment was motivated by the proposal of Bennett et al.2 in which an unknown quantum state is ‘teleported’ by Alice to Bob. As illustrated in Fig. 1, in the implementation of this procedure by Bouwmeester et al.1, an input quantum state is ‘disembodied’ into quantum and classical components, as in the original protocol2. However, in contrast to the original scheme, Bouwmeester et al.'s procedure necessarily destroys the state at Bob's receiving terminal, so a ‘teleported’ state can never emerge as a freely propagating state for subsequent examination or exploitation. In fact, teleportation is achieved only as a postdiction. Figure 1 The teleportation set-up of ref.1 PBS, polarizing beam splitter.

Date: 1998
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DOI: 10.1038/29674

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