Elementary constructive approach to the higher-rank numerical ranges of unitary matrices

Details Elementary constructive approach to the higher-rank numerical ranges of unitary matrices Elementary constructive approach to the higher-rank numerical ranges of unitary matrices

2007-07-02

arxiv.org/abs/0707.0170v1

Physics

Quantum Physics

4 figures

Scientific paper

Some problems of the quantum error-correcting codes theory can be reduced to
the investigation of the higher-rank numerical ranges of the operators related
to the error operators. We constructively verify a conjecture on the structure
of higher-rank numerical range for unitary matrices.

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