论文标题
线性光通用量子门具有更高的成功概率
Linear optical universal quantum gates with higher success probabilities
论文作者
论文摘要
通用量子门是设计量子计算机的核心。我们构建两个紧凑型量子电路，以分别由一个和两个单个光子辅助的线性光学元件实现后选择后的受控镜头（CPF）门和Toffoli门。线性光学CPF门的当前现有最大成功概率是通过诉诸辅助单个光子而不是纠缠光子对或两个单个光子来实现的。值得注意的是，我们的toffoli门是完成了1/30的当前最大成功概率，而无需使用其他纠缠光子对和基于标准分解的方法。在当前技术下，提出的两个通用门的线性光学实现是可行的，并在大规模的光学量子计算中提供了潜在的应用。
Universal quantum gates lie at the heart of designing quantum computer. We construct two compact quantum circuits to implement post-selected controlled-phase-flip (CPF) gate and Toffoli gate with linear optics assisted by one and two single photons, respectively. The current existing maximum success probability of 1/4 for linear optical CPF gate is achieved by resorting to an ancillary single photon rather than an entangled photon pair or two single photons. Remarkably, our Toffoli gate is accomplished with current maximum success probability of 1/30 without using additional entangled photon pairs and the standard decomposition-based approach. Linear optical implementations of the presented two universal gates are feasible under current technology and provide a potential application in large-scale optical quantum computing.
