Maximally entangled mixed states in two qubits

Details Maximally entangled mixed states in two qubits Maximally entangled mixed states in two qubits

2000-03-07

arxiv.org/abs/quant-ph/0003023v1

Phys. Rev. A 62, 022310 (2000)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.62.022310

We propose novel mixed states in two qubits, ``maximally entangled mixed states'', which have a property that the amount of entanglement of these states cannot be increased further by applying any unitary operations. The property is proven when the rank of the states is less than 4, and confirmed numerically in the other general cases. The corresponding entanglement of formation specified by its eigenvalues gives an upper bound of that for density matrices with same eigenvalues.

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