Single-photon non-linear optics with a quantum dot in a waveguide.
Single-photon non-linear optics with a quantum dot in a waveguide.
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DOI：
10.1038/ncomms9655
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发表时间：
2015-10-23
影响因子：
16.6
通讯作者：
Lodahl P
中科院分区：
文献类型：
--
作者：
Javadi A;Söllner I;Arcari M;Hansen SL;Midolo L;Mahmoodian S;Kiršanskė G;Pregnolato T;Lee EH;Song JD;Stobbe S;Lodahl P
光子之间强烈的非线性相互作用使经典和量子信息技术的逻辑操作成为可能。不幸的是，非线性相互作用通常很弱，因此全光逻辑门往往效率低下。确定性地耦合到传播模的量子发射体从根本上改变了这种情况，因为每个光子不可避免地与发射体相互作用，并且可能产生高度关联的多光子状态。在这里，我们证明了在单光子水平上，光子晶体波导中的单个量子点可以作为一个巨大的非线性敏感元件。非线性响应是由散射光子的强度和量子统计揭示的，它包含了纠缠光子-光子束缚态的贡献。量子非线性将立即应用于确定性的贝尔态测量和单光子晶体管，并为可扩展的基于波导的光子量子计算体系结构铺平道路。全光信息处理需要相互作用的光束，但这种非线性效应在单光子水平上是微小的。在这里，作者们证明了光子晶体波导中的单个量子点能够实现必要的巨大光学非线性。
Strong non-linear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, non-linear interactions are usually feeble and therefore all-optical logic gates tend to be inefficient. A quantum emitter deterministically coupled to a propagating mode fundamentally changes the situation, since each photon inevitably interacts with the emitter, and highly correlated many-photon states may be created. Here we show that a single quantum dot in a photonic-crystal waveguide can be used as a giant non-linearity sensitive at the single-photon level. The non-linear response is revealed from the intensity and quantum statistics of the scattered photons, and contains contributions from an entangled photon–photon bound state. The quantum non-linearity will find immediate applications for deterministic Bell-state measurements and single-photon transistors and paves the way to scalable waveguide-based photonic quantum-computing architectures. Interacting light beams are required for all-optical information processing, but such nonlinear effects are tiny at the single-photon level. Here, the authors show that a single quantum dot in a photonic-crystal waveguide enables the necessary giant optical nonlinearity.