Coherent Communication with Continuous Quantum Variables

Details Coherent Communication with Continuous Quantum Variables Coherent Communication with Continuous Quantum Variables

2006-12-20

arxiv.org/abs/quant-ph/0612170v2

Physical Review A 75, 060303(R) (2007)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.75.060303

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.

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