Improved bounds on negativity of superpositions
Zhi-Hao Ma, Zhi-Hua Chen, Shuai Han, Shao-Ming Fei, and Simone Severini
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Submission date: 17. Aug. 2012
published in: Quantum information and computation, 12 (2012) 11/12, p. 0983-0988
Keywords and phrases: superpostions, pure states, negativity
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We consider an alternative formula for the negativity based on a simple generalization of the concurrence. We use the formula to bound the amount of entanglement in a superposition of two bipartite pure states of arbitrary dimension. Various examples indicate that our bounds are tighter than the previously known results.