Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 50, Pages 20347-20351Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1207329109
Keywords
cold atomic ensembles; long-distance quantum communication; quantum computation; light-matter interface
Categories
Funding
- National Natural Science Foundation of China
- National Fundamental Research Program of China [2011CB921300]
- Chinese Academy of Sciences
- Youth Qianren Program
- European Commission through a European Research Council (ERC) Grant
- Specific Targeted Research Projects (STREP) project Hybrid Information Processing (HIP)
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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 similar to 10(8) 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.
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