Upper bound on three-tangles of reduced states of four-qubit pure states

作者：Shelly Sharma S; Sharma N K^*

来源：PHYSICAL REVIEW A, 2017, 95(6): 062311.

DOI：10.1103/PhysRevA.95.062311

Closed formulas for upper bounds on three-tangles of three-qubit reduced states in terms of three-qubit-invariant polynomials of pure four-qubit states are obtained. Our results offer tighter constraints on total three-way entanglement of a given qubit with the rest of the system than those used by Regula et al. [Phys. Rev. Lett. 113, 110501 (2014) and 116, 049902(E) (2016)] to verify monogamy of four-qubit quantum entanglement.

• 出版日期2017-6-6