电场诱导自组装量子点按需纠缠光子发射的能量调谐
Electric-field-induced energy tuning of on-demand entangled-photon emission from self-assembled quantum dots
摘要：
基于量子点的非经典光源的可扩展性依赖于对它们的不同发射能量的控制。电场提供了一种很有前途的途径来调整量子点发射能量通过量子限制斯塔克效应。然而，电场主要用于调节量子点的单光子发射能量，而对纠缠光子发射能量的电控制尚未实现，这对于使用不可区分的纠缠光子构建固态量子中继器至关重要。在这里，我们提出了一种方法来实现电子控制的能量纠缠光子发射的量子点。该装置由一个电可调量子二极管集成到压电致动器。我们发现，通过施加一个垂直的电场，用于消除量子点的精细结构分裂的临界单轴应力可以线性调谐。这允许实现能量可调的纠缠光子发射的触发源，这是迈向固态量子中继器应用的重要一步。
英文摘要：
The scalability of quantum dot based non-classical light sources relies on the control over their dissimilar emission energies. Electric fields offer a promising route to tune the quantum dot emission energy through the quantum-confined Stark effect. However, electric fields have been mostly used for tuning the energy of single-photon emission from quantum dots, while electrical control over the energy of entangled-photon emission, which is crucial for building a solid-state quantum repeater using indistinguishable entangled photons, has not been realized yet. Here, we present a method to achieve electrical control over the energy of entangled-photon emission from quantum dots. The device consists of an electrically-tunable quantum diode integrated onto a piezoactuator. We find that, through application of a vertical electric field, the critical uniaxial stress used to eliminate the fine-structure-splitting of quantum dots can be linearly tuned. This allows realization of a triggered source of energy-tunable entangled-photon emission, an important step towards a solid-state quantum repeater application.
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