Journal
PHYSICAL REVIEW A
Volume 62, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.62.012313
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We study the amount of classical communication needed for distributed quantum-information processing. In particular, we introduce the concept of remote preparation of a quantum state. Given an ensemble of states, Alice's task is to help Bob in a distant laboratory to prepare a state of her choice. We find several examples of an ensemble with an entropy S where the remote preparation can be done with a communication cost lower than the amount (2S) required by standard teleportation. We conjecture that, for an arbitrary N-dimensional pure state, its remote preparation requires 2 log(2)N bits of classical communication, as in standard teleportation.
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