The coherent bit (cobit) channel is a resource intermediate between classical and quantum communication. It produces coherent versions of teleportation and superdense coding. We extend the cobit channel to continuous variables by providing a definition of the coherent nat (conat) channel. We construct several coherent protocols that use both a position-quadrature and a momentum-quadrature conat channel with finite squeezing. Finally, we show that the quality of squeezing diminishes through successive compositions of coherent teleportation and superdense coding. © 2007 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Wilde, M., Krovi, H., & Brun, T. (2007). Coherent communication with continuous quantum variables. Physical Review A - Atomic, Molecular, and Optical Physics, 75 (6) https://doi.org/10.1103/PhysRevA.75.060303