Non-Clifford gate on optical qubits by nonlinear feedforward

TL;DR

This paper demonstrates a high-fidelity linear optical method for implementing non-Clifford gates on GKP qubits using nonlinear feedforward and ancillary states, advancing fault-tolerant optical quantum computing.

Contribution

It introduces a novel approach to perform non-Clifford operations on GKP qubits with linear optics, bypassing the need for the cubic phase gate.

Findings

Achieved high-fidelity non-Clifford operations with linear optics.

Utilized nonlinear feedforward with GKP-encoded ancillary states.

Showed versatility of nonlinear feedforward for fault-tolerant quantum computation.

Abstract

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 we can achieve linear optical implementation of non-Clifford operations on GKP qubit with high fidelity by applying the nonlinear feedforward originally developed for the cubic phase gate and using a GKP-encoded ancillary state. Our work shows the versatility of nonlinear feedforward technique important for optical implementation of the fault-tolerant continuous-variable quantum computation.