Loss Tolerant Optical Qubits
  We present a linear optics quantum computation scheme that employs a new encoding approach that incrementally adds qubits and is tolerant to photon loss errors. The scheme employs a circuit model but uses techniques from cluster state computation and achieves comparable resource usage. To illustrate our techniques we describe a quantum memory which is fault tolerant to photon loss. 
T. C. Ralph, A. J. F. Hayes and Alexei Gilchrist