Lossless quantum prefix compression for communication channels that are always open

@article{Mueller2009LosslessQP,
  title={Lossless quantum prefix compression for communication channels that are always open},
  author={Markus P. Mueller and Caroline Rogers and Rajagopal Nagarajan},
  journal={Physical Review A},
  year={2009},
  volume={79},
  pages={012302}
}
We describe a method for lossless quantum compression if the output of the information source is not known. We compute the best possible compression rate, minimizing the expected base length of the output quantum bit string (the base length of a quantum string is the maximal length in the superposition). This complements work by Schumacher and Westmoreland who calculated the corresponding rate for minimizing the output’s average length. Our compressed code words are prefix-free indeterminate… 

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