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Q: Quantenoptik und Photonik

Q 11: Quantenkommunikation I

Q 11.2: Vortrag

Samstag, 5. März 2005, 08:45–09:00, HU Audimax

Quantum Information Processing with Atomic Ensembles and Linear Optics — •Peng Xue — Institute for Theoretical Physics, University of Innsbruck

Recently, many interesting schemes have been proposed which use atomic ensembles with a large number of identical atoms as the basic system for quantum state engineering and quantum information processing. In this report, we describe an experimental scheme of preparing multipartite W type of entangled states between many atomic ensembles over long noisy channels, and generating polarizated non-maximal entanglement between two atomic ensembles, with tunable degree of entanglement, and then show some applications of these entanglement states in quantum communication. These schemes involve laser manipulation of atomic ensembles, built-in entanglement purification and well fit the status of the current experimental technology, which has some special advantages, compared with other quantum information schemes based on the control of single particles. Remarkably, we have implemented experimentally generation of non-classically correlated photon pairs from collective emission in a room temperature atomic vapor cell, which represents a significant advance towards the realization of the scalable long-distance fault-tolerant quantum communication, and opens up exciting possibilities for the potential applications in quantum communication.