A Scheme to Implement a Universal Two-Qubit Quantum Circuit using Cross-Resonance Hamiltonian
In this brief report, we propose a circuit which is locally equivalent to a recently proposed universal two-qubit quantum circuit involving two applications of special perfect entanglers (SPEs) and local y-rotations. Further, we discuss a scheme to implement the equivalent circuit using cross-resonance Hamiltonian. We implement the B-gate circuit using a CNOT gate and a \sqrt{\text{CNOT}} gate. This requires the implementation time which is approximately 64.84% of the time required to implement the same gate using two CNOT gates. We also show that (n - 1) applications of B-gate can generate both the n-qubit GHZ state and n-qubit perfect W state.