Teleportation is necessary for faithful quantum state transfer through noisy channels of maximal rank

Details Teleportation is necessary for faithful quantum state transfer through noisy channels of maximal rank Teleportation is necessary for faithful quantum state transfer through noisy channels of maximal rank

2009-12-18

arxiv.org/abs/0912.3744v2

Physics

Quantum Physics

4 pages, comments are welcome

Scientific paper

Quantum teleportation enables deterministic and faithful transmission of quantum states, provided a maximally entangled state is pre-shared between sender and receiver, and a one-way classical channel is available. Here, we prove that these resources are not only sufficient, but also necessary, for deterministically and faithfully sending quantum states through any fixed noisy channel of maximal rank, when a single use of the cannel is admitted. In other words, for this family of channels, there are no other protocols, based on different (and possibly cheaper) sets of resources, capable of replacing quantum teleportation.

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