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Adaptive Entanglement Purification Protocols with Two-way Classical Communication

Research paper by Alan W. Leung, Peter W. Shor

Indexed on: 28 Feb '07Published on: 28 Feb '07Published in: Quantum Physics



Abstract

We present a family of entanglement purification protocols that generalize four previous methods, namely the recurrence method, the modified recurrence method, and the two methods proposed by Maneva-Smolin and Leung-Shor. We will show that this family of protocols have improved yields over a wide range of initial fidelities F, and hence imply new lower bounds on the quantum capacity assisted by two-way classical communication of the quantum depolarizing channel. In particular, the yields of these protocols are higher than the yield of universal hashing for F less than 0.993 and as F goes to 1.