%0 Journal Article %J Physical Review Letters %D 2005 %T Solid-state circuit for spin entanglement generation and purification %A J. M. Taylor %A W. Dür %A P. Zoller %A A. Yacoby %A C. M. Marcus %A M. D. Lukin %X We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology. %B Physical Review Letters %V 94 %8 2005/6/15 %G eng %U http://arxiv.org/abs/cond-mat/0503255v2 %N 23 %! Phys. Rev. Lett. %R 10.1103/PhysRevLett.94.236803