Efficient entanglement criteria for discrete, continuous, and hybrid   variables
  We provide a method to construct entanglement criteria for arbitrary multipartite systems of discrete or continuous variables and hybrid combinations of both. While any set of local operators generates a sufficient condition for entanglement of arbitrary quantum states, a suitable set leads to a necessary and sufficient criterion for pure states. The criteria are readily implementable with existing technology and reveal entanglement that remains undetected by the respective state-of-the-art methods for discrete and continuous variables. 
Manuel Gessner, Luca Pezz\`e, Augusto Smerzi
quant-ph