H. M. Bharath, V. Ravishankar
We investigate the possibility of simulating partially entangled two qubit states by separable states of higher spins. First, we show that all partially entangled isotropic states can be simulated classically. We further investigate partially entangled pure states, and their binary mixtures and find that these systems forbid such a simulation, signifying that separability does not have a universal character in determining the inherent quantum nature of a state.
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http://arxiv.org/abs/1210.0745
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