Tuneable on-demand single-photon source in the microwave range.
Tuneable on-demand single-photon source in the microwave range.
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DOI：
10.1038/ncomms12588
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发表时间：
2016-08-22
影响因子：
16.6
通讯作者：
Astafiev OV
中科院分区：
文献类型：
--
作者：
Peng ZH;de Graaf SE;Tsai JS;Astafiev OV
按需单光子源是一系列未来量子技术和应用的关键元素。在这里，我们演示了基于完全可控的超导人造原子与开放传输线强耦合的可调谐按需微波光子源的工作原理。当通过控制线施加一个短的微波π脉冲激励原子时，原子发出一个光子。在由外部磁场连续调谐的7.75千兆赫到10.5千兆赫的宽频率范围内，本征受限的器件效率估计在65%-80%的范围内。激发态制备对实际效率也有影响，在我们的实验中，激发态制备效率约为90%。通过二阶关联函数中的反聚束，进一步证实了单光子源的单光子产生。该源可能在量子通信、量子信息处理和传感方面有重要的应用。微波单光子源对量子应用很重要，但它们的设计通常包含一个谐振器来固定发射光子的频率。在这里，作者展示了一种基于人造原子的可调谐按需光子源，该人造原子非对称地耦合到两条传输线上。
An on-demand single-photon source is a key element in a series of prospective quantum technologies and applications. Here we demonstrate the operation of a tuneable on-demand microwave photon source based on a fully controllable superconducting artificial atom strongly coupled to an open-ended transmission line. The atom emits a photon upon excitation by a short microwave π-pulse applied through a control line. The intrinsically limited device efficiency is estimated to be in the range 65–80% in a wide frequency range from 7.75 to 10.5 GHz continuously tuned by an external magnetic field. The actual demonstrated efficiency is also affected by the excited state preparation, which is about 90% in our experiments. The single-photon generation from the single-photon source is additionally confirmed by anti-bunching in the second-order correlation function. The source may have important applications in quantum communication, quantum information processing and sensing. Microwave single photon sources are important for quantum applications, but their design often incorporates a resonator that fixes the frequency of the emitted photon. Here, the authors demonstrate a tuneable on-demand photon source based on an artificial atom asymmetrically coupled to two transmission lines.