Quantum teleportation between remote atomic-ensemble quantum memories

• Verfasst von: Bao, Xiao-Hui [VerfasserIn]
• Verfasst von: Xu, Xiao-Fan [VerfasserIn]
• Verfasst von: Li, Che-Ming [VerfasserIn]
• Verfasst von: Yuan, Zhen-Sheng [VerfasserIn]
• Verfasst von: Pan, Jian-Wei [VerfasserIn]
• Titel: Quantum teleportation between remote atomic-ensemble quantum memories
• Verf.angabe: Xiao-Hui Bao, Xiao-Fan Xu, Che-Ming Li, Zhen-Sheng Yuan, Chao-Yang Lu, Jian-Wei Pan
• Umfang: 5 S.
• Fussnoten: Approved October 11, 2012 (received for review May 2, 2012) ; Gesehen am 28.09.2018
• Titel Quelle: Enthalten in: National Academy of Sciences (Washington, DC): Proceedings of the National Academy of Sciences of the United States of America
• Jahr Quelle: 2012
• Band/Heft Quelle: 109(2012), 50, S. 20347-20351
• ISSN Quelle: 1091-6490
• DOI: doi:10.1073/pnas.1207329109
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 158140719X

Abstract

Quantum teleportation and quantum memory are two crucial elements for large-scale quantum networks. With the help of prior distributed entanglement as a "quantum channel," quantum teleportation provides an intriguing means to faithfully transfer quantum states among distant locations without actual transmission of the physical carriers [Bennett CH, et al. (1993) Phys Rev Lett 70(13):1895-1899]. Quantum memory enables controlled storage and retrieval of fast-flying photonic quantum bits with stationary matter systems, which is essential to achieve the scalability required for large-scale quantum networks. Combining these two capabilities, here we realize quantum teleportation between two remote atomic-ensemble quantum memory nodes, each composed of ∼108 rubidium atoms and connected by a 150-m optical fiber. The spin wave state of one atomic ensemble is mapped to a propagating photon and subjected to Bell state measurements with another single photon that is entangled with the spin wave state of the other ensemble. Two-photon detection events herald the success of teleportation with an average fidelity of 88(7)%. Besides its fundamental interest as a teleportation between two remote macroscopic objects, our technique may be useful for quantum information transfer between different nodes in quantum networks and distributed quantum computing.