  We propose a quantum secure direct communication protocol using SU (2)-
invariant $2\times N$ separable states, identified as separable equivalents of
two-qubit entangled Werner states in [Bharath & Ravishankar, Phys. Rev. A 89,
062110}]. These states can be experimentally realized as incoherent
superpositions of separable polarisation-OAM states.
