How to exploit local information when distilling entanglement

Details How to exploit local information when distilling entanglement How to exploit local information when distilling entanglement

2009-06-08

arxiv.org/abs/0906.1527v4

International Journal of Quantum Information. Volume 8, Number 1-2 (2010) page 161-180

Physics

Quantum Physics

Revised contains added calculations and improved clarity, and reformatted into IJQI format. Submitted to Distributed Quantum C

Scientific paper

10.1142/S0219749910005922

Distillation protocols enable generation of high quality entanglement even in the presence of noise. Existing protocols ignore the presence of local information in mixed states produced from some noise sources such as photon loss, amplitude damping or thermalization. We propose new protocols that exploit local information in mixed states. Our protocols converge to higher fidelities in fewer rounds, and when local information is significant one of our protocols consistently improves yields by 10 fold or more. We demonstrate that our protocols can be compacted into an entanglement-pumping scheme, allowing quantum computation in distributed systems with a few qubits per location.

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