Robust transmission of non-Gaussian entanglement over optical fibers

Details Robust transmission of non-Gaussian entanglement over optical fibers Robust transmission of non-Gaussian entanglement over optical fibers

2006-05-17

arxiv.org/abs/quant-ph/0605157v1

Phys. Rev. A 74, 062303 (2006)

Physics

Quantum Physics

9 pages, 2 figures, RevTeX4, submitted to PRA

Scientific paper

10.1103/PhysRevA.74.062303

We show how the entanglement in a wide range of continuous variable non-Gaussian states can be preserved against decoherence for long-range quantum communication through an optical fiber. We apply protection via decoherence-free subspaces and quantum dynamical decoupling to this end. The latter is implemented by inserting phase shifters at regular intervals $\Delta $ inside the fiber, where $\Delta $ is roughly the ratio of the speed of light in the fiber to the bath high-frequency cutoff. Detailed estimates of relevant parameters are provided using the boson-boson model of system-bath interaction for silica fibers, and $\Delta $ is found to be on the order of a millimeter.

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