Gaussian bosonic synergy: quantum communication via realistic channels of zero quantum capacity

As with classical information, error-correcting codes enable reliable transmission of quantum information through noisy or lossy channels. In contrast to the classical theory, imperfect quantum channels exhibit a strong kind of synergy: there exist pairs of discrete memoryless quantum channels, each of zero quantum capacity, which acquire positive quantum capacity when used together. Here we show that this "superactivation" phenomenon also occurs in the more realistic setting of optical channels with attenuation and Gaussian noise. This paves the way for its experimental realization and application in real-world communications systems.Comment: 5 pages, 4 figures, one appendi

Pennsylvania Folklife Vol. 35, No. 4

• America\u27s Pieced Patchwork Quilts • A Tribute to the Late Dr. Earl F. Robacker • Sundial Lore • Square Dancing, Jigging & Hoedowning at the Folk Festival • Bronze Working at the Festival • Calico Prints • The Country Kitchen • Our Farmers Market • Festival Focus • Festival Programs • The Pennsylvania Dutch Dialect and the One Room School • Early American Lighting • Primitive Pennsylvania Dutch Carving • Heartland Taverns of the Hinterland • Tinnery • The Ancient Craft of Flute Making • Mind Your Own Beeswaxhttps://digitalcommons.ursinus.edu/pafolklifemag/1112/thumbnail.jp