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Optimal estimation of two-qubit pure-state entanglement

Authors
Journal
Physical Review A
1050-2947
Publisher
American Physical Society
Publication Date
Keywords
  • Teoria De La Informació
  • Teoria Quàntica
  • Information Theory
  • Quantum Theory

Abstract

We present optimal measuring strategies for an estimation of the entanglement of unknown two-qubit pure states and of the degree of mixing of unknown single-qubit mixed states, of which N identical copies are available. The most general measuring strategies are considered in both situations, to conclude in the first case that a local, although collective, measurement suffices to estimate entanglement, a nonlocal property, optimally.

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