Takeda Shuntaro, Furusawa Akira
Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Rev Lett. 2017 Sep 22;119(12):120504. doi: 10.1103/PhysRevLett.119.120504. Epub 2017 Sep 21.
We propose a scalable scheme for optical quantum computing using measurement-induced continuous-variable quantum gates in a loop-based architecture. Here, time-bin-encoded quantum information in a single spatial mode is deterministically processed in a nested loop by an electrically programmable gate sequence. This architecture can process any input state and an arbitrary number of modes with almost minimum resources, and offers a universal gate set for both qubits and continuous variables. Furthermore, quantum computing can be performed fault tolerantly by a known scheme for encoding a qubit in an infinite-dimensional Hilbert space of a single light mode.
我们提出了一种可扩展的光学量子计算方案，该方案在基于环路的架构中使用测量诱导的连续变量量子门。在这里，单空间模式下的时间编码量子信息通过电可编程门序列在嵌套环路中进行确定性处理。这种架构可以用几乎最少的资源处理任何输入状态和任意数量的模式，并为量子比特和连续变量提供通用门集。此外，可以通过一种已知的方案在单光模式的无限维希尔伯特空间中对量子比特进行编码，从而实现容错量子计算。
