Non-Clifford gate on optical qubits by nonlinear feedforward.

In a continuous-variable optical system, the Gottesman-Kitaev-Preskill (GKP) qubit is a promising candidate for fault-tolerant quantum computation. To implement non-Clifford operations on GKP qubits, non-Gaussian operations are required. In this context, the implementation of a cubic phase gate by combining nonlinear feedforward with ancillary states has been widely researched. Recently, however, it is pointed out that the cubic phase gate is not the most suitable for non-Clifford operations on GKP qubits. In this work, we show that by adapting the nonlinear feedforward and ancillary states in the cubic phase gate setup to the GKP qubits, we can achieve linear optical implementation of non-Clifford operations on GKP qubit with high fidelity. Our work shows the versatility of nonlinear feedforward technique important for optical implementation of the fault-tolerant continuous-variable quantum computation.