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quant-ph2012★ 152 cited
Genuinely Multipartite Concurrence of N-qubit X-matrices
S. M. Hashemi Rafsanjani, M. Huber, C. J. Broadbent +1
We find an algebraic formula for the N-partite concurrence of N qubits in an X-matrix. X- matricies are density matrices whose only non-zero elements are diagonal or anti-diagonal…
quant-ph2012★ 3 cited
X-matrices provide a lower bound of concurrence
S. M. Hashemi rafsanjani, S. Agarwal
By focusing on the X-matrix part of a density matrix of two qubits we provide an algebraic lower bound for the concurrence. The lower bound is generalized for cases beyond two qubi…