期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.100501
关键词
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资金
- MIUR [PRIN 2007FYETBY]
- Regione Piemonte [E14]
- San Paolo Foundation
- NATO [CBP.NR.NRCL.983251]
Entanglement is the central resource of quantum information processing and the precise characterization of entangled states is a crucial issue for the development of quantum technologies. This leads to the necessity of a precise, experimental feasible measure of entanglement. Nevertheless, such measurements are limited both from experimental uncertainties and intrinsic quantum bounds. Here we present an experiment where the amount of entanglement of a family of two-qubit mixed photon states is estimated with the ultimate precision allowed by quantum mechanics.
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