Controlled unknown quantum operations on hybrid systems
He Yong1, †, , Luo Ming-Xing2, 3
       

A schematic circuit for the controlled multi-qubit operation with ancillary four-dimensional systems. U is an unknown multi-qubit operation which should be performed on the system of A1, …, An conditional on the state of O. B1,…, Bn are four-dimensional systems. Controlled-S is defined in Fig. 2.