Grant, E; Benedetti, M; Cao, S; Hallam, A; Lockhart, J; Stojevic, V; Green, AG; Grant, E; Benedetti, M; Cao, S; Hallam, A; Lockhart, J; Stojevic, V; Green, AG; Severini, S; - view fewer (2018) Hierarchical quantum classifiers. npj Quantum Information , 4 , Article 65. 10.1038/s41534-018-0116-9.