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International Conference on Quantum Information

Efficient Quantum Repeaters without Entanglement Purification

László Gyöngyösi, Sándor Imre

Published Jan 1, 2011• 2 citations
Publisher

Abstract

This paper presents a fundamentally new idea, which enhances the efficiency of the quantum repeaters. It is possible to develop a quantum repeater with the elimination of the very inefficient and expensive purification process.
DOI
10.1364/icqi.2011.qmi14

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We discuss a long-distance quantum communication system based on entangled photon pairs, which apply entanglement as its fundamental resource. For distances longer than the coherence length of a counterpart noisy quantum channel, the fidelity of transmission is ordinarily so low that standard purification processes are not applicable. The quantum repeater stretches the length of the entangled photon pairs. And the high fidelity entanglement of photons between sender and receiver is obtained by entanglement purification and entanglement swapping. We compare the nested repeater with the common repeater and show that it outperforms the latter, which is built an EPR pair in less time.