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KF5JRV > TECH 08.07.16 16:25l 29 Lines 1891 Bytes #999 (0) @ WW
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Subj: First Teleportation
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The First Teleportation from One Macroscopic Object to Another November 8, 2012
Xiao-Hui Bao and colleagues at the University of Science and Technology of
China in Hefei teleported quantum information from one ensemble of atoms to
another 150 meters away, a demonstration seen as a significant milestone
towards quantum routers and a quantum Internet.
"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,ö quantum teleportation provides an intriguing means to
faithfully transfer quantum states among distant locations without actual
transmission of the physical carriers. 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 approxmatley 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" (Xiao-Hui Bao Xiao-Fan Xuc,
Che-Ming Lic, Zhen-Sheng Yuana, Chao-Yang Lua, and Jian-Wei Pana,
"Quantum teleportation between remote atomic-ensemble quantum memories,"
Proc. Nat. Acad. Sci. America.
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