Remote Preparation of Mixed States via Noisy Entanglement
  We present a practical and general scheme of remote preparation for pure and mixed state, in which an auxiliary qubit and controlled-NOT gate are used. We discuss the remote state preparation (RSP) in two important types of decoherent channel (depolarizing and dephaseing). In our experiment, we realize RSP in the dephaseing channel by using spontaneous parametric down conversion (SPDC), linear optical elements and single photon detector. 
Guo-Yong Xiang, Jian Li, Bo Yu, and Guang-Can Guo