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- W2894468748 abstract "The dimension of the state space for information encoding offered by the transverse structure of light is usually limited by the finite size of apertures. The widely used orbital angular momentum (OAM) modes in free-space communications cannot achieve the theoretical maximum transmission capacity unless the radial degree of freedom is multiplexed into the protocol. Here we experimentally demonstrate a free-space quantum key distribution (QKD) protocol that encodes information in all three transverse degrees of freedom: spin, azimuthal, and radial quantum numbers of photons. Our protocol presents an important step towards the goal of reaching the capacity limit of the finite-sized apertures in free-space QKD link. We realized 8-dimensional information encoding onto single photons, and extension to a higher dimension is straightforward. Our protocol relies on a scheme that can sort photons in two mutually unbiased bases, each involving three transverse degrees of freedom. In addition to boosting the transmission rate, the spatial mode sorting scheme developed for this QKD protocol may be useful to other applications that involve spatial modes of photons." @default.
- W2894468748 created "2018-10-05" @default.
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- W2894468748 date "2018-09-26" @default.
- W2894468748 modified "2023-09-27" @default.
- W2894468748 title "High-dimensional free-space quantum key distribution using spin, azimuthal, and radial quantum numbers" @default.
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