Figure 5
(a) The initial state is prepared in |g〉A|g〉X|0〉B|0〉C. (b) The ECS is created by the scheme in Fig. 3. After two Hadamard operations in superconducting qubits of A and X in (c), two entangling gates between the superconducting qubit A (X) and the CV qubit B (C) given by 
to create the four-partite entangled state in (d).
