Teleportation can only transfer speakable quantum information

Details Teleportation can only transfer speakable quantum information Teleportation can only transfer speakable quantum information

2010-08-05

arxiv.org/abs/1008.0967v1

Physics

Quantum Physics

4 pages, no figures

Scientific paper

Speakable information can be encoded into strings of bits, whereas unspeakable information, e.g. a time reference, cannot. In classical mechanics, distant parties that share correlated systems (e.g. a pair of synchronized clocks) can transfer unspeakable information by transmitting only speakable information (e.g. the time difference between one party's clock and the synchronized ones). Surprisingly, this is not always true in quantum mechanics: in the absence of a prior shared reference, teleportation can transfer only the speakable part of the quantum state (except for transformations induced by finite symmetry groups). Quantum correlations however allow for optimal remote state preparation of an arbitrary state using a state-dependent entangled resource.

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