Kimikazu Kato Hiroshi Imai Keiko Imai Error Analysis of a Numerical Calculation about One-qubit Quantum Channel Capacity. 265-269 2007 conf/isvd/2007 ISVD http://doi.ieeecomputersociety.org/10.1109/ISVD.2007.21 db/conf/isvd/isvd2007.html#KatoII07