X states of the same spectrum and entanglement as all two-qubit states

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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 of the same spectrum and entanglement.

Original languageEnglish
Article number293
JournalQuantum Information Processing
Volume17
Issue number11
DOIs
StatePublished - 1 Nov 2018

Keywords

  • Concurrence
  • Entanglement
  • Entanglement-preserving unitary
  • TGX states
  • True-generalized X states
  • X states

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