arXiv 1601.071422016-01-26quant-phphysics.atom-ph

利用冷原子量子存储器产生波形可调的单光子

Generation of single photons with highly tunable wave shape from a cold atomic quantum memory

Pau Farrera, Georg Heinze, Boris Albrecht, Melvyn Ho, Matías Chávez, Colin Teo, Nicolas Sangouard, Hugues de Riedmatten

备注：: 10 pages, 7 figures
发表信息：: Nat. Commun. 7, 13556 (2016)
DOI：: 10.1038/ncomms13556

摘要：

我们报道了一个基于铷原子冷系综的具有高度可调光子形状的单光子源。我们采用DLCZ方案实现了一种发射型量子存储器，它可以作为具有可控延迟的光子对源来工作。我们发现，可以通过改变驱动读脉冲的形状来精确地控制所发射的读光子的时间波形。我们产生的光子的持续时间变化超过三个数量级，高达10 μs，而没有显着的变化的读出效率。我们证明了非经典的发射光子通过测量它们的反聚束，在低激发概率显示近单光子行为。我们还表明，光子发射在一个纯粹的状态，通过测量无条件的自相关函数。最后，为了证明该源在实际应用中的可用性，我们创建了具有上升指数或双峰波形的超长单光子，这对几个量子信息任务很重要。

英文摘要：

We report on a single photon source with highly tunable photon shape based on a cold ensemble of Rubidium atoms. We follow the DLCZ scheme to implement an emissive quantum memory, which can be operated as a photon pair source with controllable delay. We find that the temporal wave shape of the emitted read photon can be precisely controlled by changing the shape of the driving read pulse. We generate photons with temporal durations varying over three orders of magnitude up to 10 μs without a significant change of the read-out efficiency. We prove the non-classicality of the emitted photons by measuring their antibunching, showing near single photon behavior at low excitation probabilities. We also show that the photons are emitted in a pure state by measuring unconditional autocorrelation functions. Finally, to demonstrate the usability of the source for realistic applications, we create ultra-long single photons with a rising exponential or doubly peaked wave shape which are important for several quantum information tasks.

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英文摘要：

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