Abstract
We investigate the Peres–Horodecki positive partial transpose criterion in the context of conserved quantities and derive a condition of inseparability for a composite bipartite system depending only on the dimensions of its subsystems, which leads to a bi-linear entanglement witness for the two qubit system. A separability inequality using generalized Schrodinger–Robertson uncertainty relation taking suitable operators, has been derived, which proves to be stronger than the bi-linear entanglement witness operator. In the case of mixed density matrices, it identically distinguishes the separable and non separable Werner states.
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We acknowledge useful comments from Prof. G. S. Agarwal and Prof. Paul Busch.
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Goswami, A.K., Panigrahi, P.K. Uncertainty Relation and Inseparability Criterion. Found Phys 47, 229–235 (2017). https://doi.org/10.1007/s10701-016-0052-5
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DOI: https://doi.org/10.1007/s10701-016-0052-5