Entanglement criteria for microscopic-macroscopic systems

Year: 2010

Authors: Spagnolo N., Vitelli C., Sciarrino F., De Martini F.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Consorzio Nazl Interuniv Sci Fis Mat, I-00185 Rome, Italy; Ist Nazl Ottica, I-50125 Florence, Italy; Acad Nazl Lincei, I-00165 Rome, Italy.

Abstract: We discuss the conclusions that can be drawn on a recent experimental micro-macro entanglement test [De Martini, Sciarrino, and Vitelli, Phys. Rev. Lett. 100, 253601 (2008)]. The system under investigation is generated through optical parametric amplification of one photon belonging to an entangled pair. The adopted entanglement criterion makes it possible to infer the presence of entanglement before losses that occur on the macrostate under a specific assumption. In particular, an a priori knowledge of the system that generates the micro-macro pair is necessary to exclude a class of separable states that can reproduce the obtained experimental results. Finally, we discuss the feasibility of a micro-macro genuine entanglement test on the analyzed system by considering different strategies, which show that in principle a fraction e, proportional to the number of photons that survive the lossy process, of the original entanglement persists in any loss regime.

Journal/Review: PHYSICAL REVIEW A

Volume: 82 (5)      Pages from: 52101-1  to: 52101-10

More Information: We acknowledge support by Futuro in Ricerca Project HYTEQ and Progetto d’Ateneo of Sapienza Universita di Roma.
KeyWords: Quantum; Separability
DOI: 10.1103/PhysRevA.82.052101

Citations: 20
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