Protected State Transfer via an Approximate Quantum Adder
  We propose a decoherence protected protocol for sending single photon quantum states through depolarizing channels. This protocol is implemented via an approximate quantum adder engineered through spontaneous parametric down converters, and shows higher success probability than distilled quantum teleportation protocols for distances below a threshold depending on the properties of the channel. 
G. Gatti, D. Barberena, M. Sanz, E. Solano
quant-ph cond-mat.mes-hall cond-mat.supr-con