Deterministic multi-mode gates on a scalable photonic quantum computing platform
Deterministic multi-mode gates on a scalable photonic quantum computing platform
复制标题
可扩展光子量子计算平台上的确定性多模门
DOI：
10.1038/s41567-021-01296-y
复制
发表时间：
2021-07-08
期刊：
影响因子：
19.6
通讯作者：
Andersen, Ulrik L.
中科院分区：
文献类型：
--
作者：
Larsen, Mikkel V.;Guo, Xueshi;Andersen, Ulrik L.
量子计算可以用许多不同的硬件平台和计算协议来实现。一个非常有前途的，潜在的可扩展的想法是将联合收割机与测量诱导的量子信息处理结合起来。在这种方法中，门操作可以通过对多体纠缠量子态（所谓的团簇态）的光学测量来实现。在此之前，已经实现了一些非通用或不可扩展的簇态的量子门，但尚未实现用于通用可扩展量子计算的全套量子门。在这里，我们提出并证明了确定性实施的一组多模测量诱导量子门在一个大的二维光团簇状态使用相位控制连续变量正交测量。每个门都被编程为高效正交测量的相位，通过集群状态的隐形传态执行转换。我们进一步在三模输入态上实现了一个由10个单模门和2个双模门组成的小型量子电路。如果改进团簇态的纠缠度，并提供Gottesman-Kitaev-Preskill编码的量子态，那么基于测量的量子计算可以在纠缠态上实现量子门，而不需要复杂的多量子比特相干动力学。一组足以用于通用量子计算的门现在已经在可编程光学平台上实现。
Quantum computing can be realized with numerous different hardware platforms and computational protocols. A highly promising, and potentially scalable, idea is to combine a photonic platform with measurement-induced quantum information processing. In this approach, gate operations can be implemented through optical measurements on a multipartite entangled quantum state-a so-called cluster state. Previously, a few quantum gates on non-universal or non-scalable cluster states have been performed, but a full set of gates for universal scalable quantum computing has not been realized. Here we propose and demonstrate the deterministic implementation of a multi-mode set of measurement-induced quantum gates in a large two-dimensional optical cluster state using phase-controlled continuous-variable quadrature measurements. Each gate is programmed into the phases of high-efficiency quadrature measurements, which execute the transformations by teleportation through the cluster state. We further execute a small quantum circuit consisting of 10 single-mode gates and 2 two-mode gates on a three-mode input state. Fault-tolerant universal quantum computing is possible with this platform if the cluster-state entanglement is improved and a supply of states with Gottesman-Kitaev-Preskill encoding is available.Measurement-based quantum computing performs quantum gates on entangled states without difficult multi-qubit coherent dynamics. A set of gates sufficient for universal quantum computing has now been implemented on a programmable optical platform.