Towards global quantum communication: beam wandering preserves quantumness

Details Towards global quantum communication: beam wandering preserves quantumness Towards global quantum communication: beam wandering preserves quantumness

2011-10-07

arxiv.org/abs/1110.1440v1

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

Tap-proof long-distance quantum communication requires a deep understanding of the strong losses in communication channels. Here we provide a rigorous treatment of the effects of beam-wandering, one of the leading disturbances in free space, on the quantum properties of light. From first principles we derive the beam-transmission probability through an aperture at the receiver, with the aim to completely characterize the quantum state of light. Surprisingly, beam wandering may preserve the quantumness better than a standard attenuating channel of the same losses.

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