Optimal approach to quantum communication using dynamic programming

Details Optimal approach to quantum communication using dynamic programming Optimal approach to quantum communication using dynamic programming

2007-10-31

arxiv.org/abs/0710.5808v1

PNAS 104, 17291-17296, 2007

Physics

Quantum Physics

9 pages, 6 figures

Scientific paper

10.1073/pnas.0703284104

Reliable preparation of entanglement between distant systems is an outstanding problem in quantum information science and quantum communication. In practice, this has to be accomplished via noisy channels (such as optical fibers) that generally result in exponential attenuation of quantum signals at large distances. A special class of quantum error correction protocols--quantum repeater protocols--can be used to overcome such losses. In this work, we introduce a method for systematically optimizing existing protocols and developing new, more efficient protocols. Our approach makes use of a dynamic programming-based searching algorithm, the complexity of which scales only polynomially with the communication distance, letting us efficiently determine near-optimal solutions. We find significant improvements in both the speed and the final state fidelity for preparing long distance entangled states.

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