Wavelength-tunable sources of entangled photons interfaced with atomic vapours.
Wavelength-tunable sources of entangled photons interfaced with atomic vapours.
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DOI：
10.1038/ncomms10375
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发表时间：
2016-01-27
影响因子：
16.6
通讯作者：
Rastelli A
中科院分区：
文献类型：
--
作者：
Trotta R;Martín-Sánchez J;Wildmann JS;Piredda G;Reindl M;Schimpf C;Zallo E;Stroj S;Edlinger J;Rastelli A
利用光的量子特性进行保密通信的前景不断刺激着对合适的纠缠光子源的搜索和研究。单半导体量子点是最有吸引力的量子点之一，因为它可以确定性地产生不可分辨的纠缠光子，并且与当前的光子集成技术兼容。然而，由于缺乏对纠缠光子能量的控制，阻碍了在需要远程量子纠缠隐形传态的协议中利用不同的量子点。在这里，我们介绍了基于量子点的偏振纠缠光子源，其能量可以通过三向应变工程调谐，而不会降低光子对的纠缠度。作为量子通信的测试平台，我们将量子点与原子蒸气云连接，并展示了来自单个量子发射器的缓慢纠缠光子。这些结果为实现混合量子网络铺平了道路，在混合量子网络中，纠缠是使用光电设备在遥远的各方之间分布的。 量子点可以产生纠缠光子，但实际应用需要仔细控制光子波长。在这里，作者使用三向应变工程来克服这个问题，并将来自量子点的纠缠光子与自然原子云连接起来。
The prospect of using the quantum nature of light for secure communication keeps spurring the search and investigation of suitable sources of entangled photons. A single semiconductor quantum dot is one of the most attractive, as it can generate indistinguishable entangled photons deterministically and is compatible with current photonic-integration technologies. However, the lack of control over the energy of the entangled photons is hampering the exploitation of dissimilar quantum dots in protocols requiring the teleportation of quantum entanglement over remote locations. Here we introduce quantum dot-based sources of polarization-entangled photons whose energy can be tuned via three-directional strain engineering without degrading the degree of entanglement of the photon pairs. As a test-bench for quantum communication, we interface quantum dots with clouds of atomic vapours, and we demonstrate slow-entangled photons from a single quantum emitter. These results pave the way towards the implementation of hybrid quantum networks where entanglement is distributed among distant parties using optoelectronic devices. Quantum dots can produce entangled photons, but careful control over photon wavelength is required for real-life applications. Here, the authors use three-directional strain engineering to overcome this problem and to interface entangled photons from quantum dots with a cloud of natural atoms.