Spectrum and separability of mixed 2-qubit X-states
The separable mixed 2-qubit X-states are classified in accordance with degeneracies in the spectrum of density matrices. It is shown that there are four classes of separable X-states, among them: one 4D family, a pair of 2D family and a single, zero-dimensional maximally mixed state.
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Zusammenfassung: | The separable mixed 2-qubit X-states are classified in accordance with
degeneracies in the spectrum of density matrices. It is shown that there are
four classes of separable X-states, among them: one 4D family, a pair of 2D
family and a single, zero-dimensional maximally mixed state. |
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DOI: | 10.48550/arxiv.1609.06209 |