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quant-ph2008★ 96 cited
Maximal Sets of Mutually Unbiased Quantum States in Dimension Six
Stephen Brierley, Stefan Weigert
We study sets of pure states in a Hilbert space of dimension d which are mutually unbiased (MU), that is, the squares of the moduli of their scalar products are equal to zero, one,…
quant-ph2007★ 46 cited
On maximal entanglement between two pairs in four-qubit pure states
Stephen Brierley, Atsushi Higuchi
We show that the state with the highest known average two-particle von Neumann entanglement entropy proposed by Sudbery and one of the authors gives a local maximum of this entropy…