X states of the same spectrum and entanglement as all two-qubit states
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DOI: 10.1007/s11128-018-2061-0
Abstract: We present an explicit family of two-qubit X states with entanglement-preserving unitary equivalence to the set of general states; that is, for any spectrum–entanglement combination achievable by general states, this family contains an X state… read more here.
Keywords: entanglement two; two qubit; qubit states; states spectrum ... See more keywords