Continuous-variable quantum teleportation through lossy channels

Details Continuous-variable quantum teleportation through lossy channels Continuous-variable quantum teleportation through lossy channels

2001-06-05

arxiv.org/abs/quant-ph/0106022v2

Physics

Quantum Physics

10 pages, 7 figures. Submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.65.022310

The ultimate limits of continuous-variable single-mode quantum teleportation due to absorption are studied, with special emphasis on (quasi-)monochromatic optical fields propagating through fibers. It is shown that even if an infinitely squeezed two-mode squeezed vacuum were used, the amount of information that would be transferred quantum mechanically over a finite distance is limited and effectively approaches to zero on a length scale that is much shorter than the (classical) absorption length. Only for short distances the state-dependent teleportation fidelity can be close to unity. To realize the largest possibly fidelity, an asymmetrical equipment must be used, where the source of the two-mode squeezed vacuum is nearer to Alice than to Bob and in consequence the coherent displacement performed by Bob cannot be chosen independently of the transmission lengths.

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