On the Landau-Streater channel for orthogonal and unitary groups

In $d=2j+1$ dimensions, the Landau-Streater quantum channel is defined on the basis of spin j representation of the $su(2)$ algebra. Only for $j=1$, this channel is equivalent to the Werner-Holevo channel and enjoys covariance properties with respect to the group $SU(3)$. We extend this class of channels to higher dimensions in a way which is based on the Lie algebra $so(d)$. As a result it retains its equivalence to the Werner-Holevo channel in arbitrary dimensions. The resulting channel is covariant with respect to the unitary group $U(d)$. We then modify this channel in a way which can act as a noisy channel on qudits. The resulting modified channel now interpolates between the identity channel and the Werner-Holevo channel and its covariance is reduced to the subgroup of orthogonal matrices $SO(d)$. We then investigate some of the propeties of the resulting one-parameter family of channels, including their spectrum, their regions of lack of indivisibility, their one-shot classical capacity, entanglement-assisted capacity and the closed form of their complement channel and a possible lower bound for their quantum capacity. We briefly mention how the channel can be generalized to unitary groups.