Non-Clifford gate on optical qubits by nonlinear feedforward
Non-Clifford gate on optical qubits by nonlinear feedforward
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DOI：
10.1103/physrevresearch.3.043026
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发表时间：
2021-10-11
影响因子：
4.2
通讯作者：
Furusawa, Akira
中科院分区：
文献类型：
--
作者：
Konno, Shunya;Asavanant, Warit;Furusawa, Akira
在连续可变光学系统中，Gottesman-Kitaev-Preskill（GKP）量子比特是容错量子计算的一个有前途的候选者。为了在GKP量子比特上实现非Clifford操作，需要非高斯操作。在这种背景下，通过将非线性前馈与辅助状态相结合来实现三次相位门已经得到了广泛的研究。然而，最近有人指出，立方相位门并不是最适合GKP量子比特上的非Clifford操作。在本文中，我们表明，我们可以实现线性光学实现的非Clifford操作的GKP量子比特高保真度，通过应用非线性前馈最初开发的立方相位门和使用GKP编码的辅助状态。本文展示了非线性前馈技术的多功能性，这对于容错连续变量量子计算的光学实现是非常重要的。
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 was pointed out that the cubic phase gate is not the most suitable for non-Clifford operations on GKP qubits. In this paper, we show that we can achieve linear optical implementation of non-Clifford operations on GKP qubits with high fidelity by applying the nonlinear feedforward originally developed for the cubic phase gate and using a GKP-encoded ancillary state. Our paper shows the versatility of the nonlinear feedforward technique-important for optical implementation of the fault-tolerant continuous-variable quantum computation.