Toward large-scale fault-tolerant universal photonic quantum computing
Toward large-scale fault-tolerant universal photonic quantum computing
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DOI：
10.1063/1.5100160
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发表时间：
2019-06-01
期刊：
影响因子：
5.6
通讯作者：
Furusawa, A.
中科院分区：
文献类型：
--
作者：
Takeda, S.;Furusawa, A.
光子量子计算是实现普适量子计算的主要途径之一。然而，光子量子计算的大规模实现受到其内在困难的阻碍，如光子量子比特的概率纠缠门和缺乏可扩展的方法来构建光子电路。在这里，我们讨论如何利用最近出现的两个关键想法来克服这些限制。一种是量子比特-连续变量混合方法，用于实现确定的光子量子比特通用门集合。另一种是在不改变光子电路结构的情况下进行任意大规模量子计算的时域多路复用技术。这些想法结合在一起将使通用光子量子计算机的可扩展实现成为可能，其中可以结合硬件高效的纠错码。此外，这种系统的全光实现原则上可以将运算带宽增加到太赫兹以上，最终实现具有超高运算频率的大规模容错通用量子计算机。
Photonic quantum computing is one of the leading approaches to universal quantum computation. However, large-scale implementation of photonic quantum computing has been hindered by its intrinsic difficulties, such as probabilistic entangling gates for photonic qubits and lack of scalable ways to build photonic circuits. Here, we discuss how to overcome these limitations by taking advantage of two key ideas which have recently emerged. One is a hybrid qubit-continuous variable approach for realizing a deterministic universal gate set for photonic qubits. The other is the time-domain multiplexing technique to perform arbitrarily large-scale quantum computing without changing the configuration of photonic circuits. These ideas together will enable scalable implementation of universal photonic quantum computers in which hardware-efficient error correcting codes can be incorporated. Furthermore, all-optical implementation of such systems can increase the operational bandwidth beyond terahertz in principle, ultimately enabling large-scale fault-tolerant universal quantum computers with ultrahigh operation frequency.