Spin-based single-photon transistor, dynamic random access memory, diodes, and routers in semiconductors
Spin-based single-photon transistor, dynamic random access memory, diodes, and routers in semiconductors
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DOI：
10.1103/physrevb.94.245307
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发表时间：
2016-12-14
影响因子：
3.7
通讯作者：
Hu, C. Y.
中科院分区：
文献类型：
--
作者：
Hu, C. Y.
量子计算机和量子互联网的实现不仅需要量子门和量子存储器，还需要单光子水平的晶体管来控制编码在单光子上的信息流。单光子晶体管（SPT）是一种量子极限下的光学晶体管，它利用单个光子来打开或阻塞光子通道。与以前所有基于单光子非线性的SPT方案形成鲜明对比，在这里，我提出了一种基于线性光学效应的高增益和高速（高达THz）SPT的设计：在双面光学微腔中由单个自旋引起的巨大圆双折射。门光子通过投影测量设置自旋状态并控制光在光通道中的传播。这种自旋腔晶体管可以直接配置为二极管，路由器，DRAM单元，开关，调制器等。由于量子门和晶体管的双重性，自旋腔单元为未来的互联网提供了理想的固态平台：全光互联网与量子互联网的混合。
The realization of quantum computers and quantum Internet requires not only quantum gates and quantum memories, but also transistors at single-photon levels to control the flow of information encoded on single photons. Single-photon transistor (SPT) is an optical transistor in the quantum limit, which uses a single photon to open or block a photonic channel. In sharp contrast to all previous SPT proposals which are based on single-photon nonlinearities, here I present a design for a high-gain and high-speed (up to THz) SPT based on a linear optical effect: giant circular birefringence induced by a single spin in a double-sided optical microcavity. A gate photon sets the spin state via projective measurement and controls the light propagation in the optical channel. This spin-cavity transistor can be directly configured as diodes, routers, DRAM units, switches, modulators, etc. Due to the duality as quantum gate and transistor, the spin-cavity unit provides a solid-state platform ideal for future Internet: a mixture of all-optical Internet with quantum Internet.