Engineering large-scale entanglement in the quantum optical frequency   comb: influence of the quasiphasematching bandwidth and of dispersion
  One of the most scalable methods for continuous-variable quantum computing is to encode quantum information in the quantum optical frequency comb generated by an optical parametric oscillator (OPO). The scalability is limited by the quasiphasematching bandwidth and dispersion of the OPO. We study both factors in this article. The results show that 3200 qumodes are probably entangled in our recent demonstration of a record 60-qumode entanglement. 
Pei Wang, Wenjiang Fan, and Olivier Pfister
physics.optics quant-ph