Quantum secure direct communication with SU(2) invariant separable polarisation- OAM states
Abstract
We propose a quantum secure direct communication protocol using SU (2)- invariant 2× 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.
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