Macroscopic quantum entanglement in light reflection from bose-einstein condensates

Year: 2009

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

Autors Affiliation: Dipartimento di Fisica, Università La Sapienza, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma 00185, Italy; Accademia Nazionale dei Lincei, Roma, Italy; Centro di Studi e Ricerche Enrico Fermi, Via Panisperna 89/A, Roma 00184, Italy; Dipartimento di Energetica, LENS, Università di Firenze, via N. Carrara 1, I-50019 Sesto F.no FI, Italy

Abstract: The present work investigates quantum phenomena with large size systems generated in the microscopic world and then transferred in the macro one through an amplification process. Precisely, a microscopic entangled photon state is created by a nonlinear optical process, then one subsystem is injected into an optical parametric amplifier and then converted into a macro – state consisting of N ˜ 3.5 × 10 4 photons in a quantum superposition. By adopting a local filtering technique, we then demonstrate the entanglement of the bipartite system. The new conceptual framework paves the way toward the generation of light-matter entangled states by coupling the output radiation with a Bose-Einstein condensate. The multiphoton superposition generated by a quantum-injected optical parametric amplifier (QI-OPA) can be made to interact with a Mirror-BEC shaped as a Bragg interference structure.

Journal/Review: INTERNATIONAL JOURNAL OF QUANTUM INFORMATION

Volume: 7 (SUPPL.)      Pages from: 171  to: 177

More Information: Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR, PRIN 06. Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR, 05. – We acknowledge interesting discussions with C. Fort, L. Fallani and M. Inguscio. The work is supported by MIUR (N. PRIN 06, PRIN 05) and CNISM (Innesco 2006).
KeyWords: Bose-einstein condensate; Light-matter entanglement; Quantum injected optical parametric amplifier
DOI: 10.1142/S0219749909004694

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