Spin-photon interface and spin-controlled photon switching in a nanobeam waveguide
Spin-photon interface and spin-controlled photon switching in a nanobeam waveguide
复制标题
纳米光束波导中的自旋 - 光子接口与自旋控制的光子开关
DOI：
10.1038/s41565-018-0091-5
复制
发表时间：
2018-05-01
影响因子：
38.3
通讯作者：
Lodahl, Peter
中科院分区：
文献类型：
--
作者：
Javadi, Alisa;Ding, Dapeng;Lodahl, Peter
电子的自旋是一种很有前途的记忆状态和量子比特。连接空间上相距很远的自旋态将使量子节点和基于电子自旋的量子网络成为可能。为了实现这一目标，集成的自旋-光子界面将是一次重大的飞跃，因为它结合了单自旋的记忆能力和通过光子有效地传输信息。在这里，我们展示了量子点中电子的自旋和纳米光子波导中的光子之间的这种高效和光学可编程的界面。可以在基态下确定性地制备自旋，保真度高达96%。随后，该系统被用来实现单自旋光子开关，在该开关中，电子的自旋态引导光子流过波导。自旋-光子接口可以实现片上光子-光子门、单光子晶体管和光子簇态的有效生成。
The spin of an electron is a promising memory state and qubit. Connecting spin states that are spatially far apart will enable quantum nodes and quantum networks based on the electron spin. Towards this goal, an integrated spin-photon interface would be a major leap forward as it combines the memory capability of a single spin with the efficient transfer of information by photons. Here, we demonstrate such an efficient and optically programmable interface between the spin of an electron in a quantum dot and photons in a nanophotonic waveguide. The spin can be deterministically prepared in the ground state with a fidelity of up to 96%. Subsequently, the system is used to implement a single-spin photonic switch, in which the spin state of the electron directs the flow of photons through the waveguide. The spin-photon interface may enable on-chip photon-photon gates, single-photon transistors and the efficient generation of a photonic cluster state.