We investigate the conditions under which unconditional dense coding can be achieved using continuous variable entanglement. We consider the effect of entanglement impurity and detector efficiency and discuss experimental verification. We conclude that the requirements for a strong demonstration are not as stringent as previously thought and are within the reach of present technology.
@article{arxiv.quant-ph/0208117,
title = {Unconditional Continuous Variable Dense Coding},
author = {T. C. Ralph and E. H. Huntington},
journal= {arXiv preprint arXiv:quant-ph/0208117},
year = {2009}
}