1Department of Mathematics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman
2department of mathematics, Vali-e-Asr University of Rafsanjan, Iran
3department of mathematics, Vali-e-Asr University of Rafsanjan
The rank-k numerical range has a close connection to the construction of quantum error correction code for a noisy quantum channel. For noisy quantum channel, a quantum error correcting code of dimension k exists if and only if the associated joint rank-k numerical range is non-empty. In this paper the notion of joint rank-k numerical range is generalized and some statements of [2011, Generalized numerical ranges and quantum error correction, J. Operator Theory, 66: 2, 335-351.] are extended.