Table 1 The cost of CNOT on a hybrid two-qubit system (spin and photon or photon and spin) for each elementary ququart logic gate.
From: Photonic ququart logic assisted by the cavity-QED system
Ququart gates | Z4(θ) | T1(ϑ1) | T2(ϑ2) | T3(ϑ2) |
Hybrid CNOT cost | 4 | 2 | 6 | 2 |
Controlled ququart gates | C[Z4(θ)] | C[T1(ϑ1)] | C[T2(ϑ2)] | C[T3(ϑ3)] |
Hybrid CNOT cost | 8 | 4 | 8 | 4 |
