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纳米金刚石中的NV-center(Nitrogen-Vacancy center)是目前室温下具有高发射率和稳定性的可见光波段单光子源,而如何实现及优化红外单光子源则是未来实现量子信息和量子通信应用的一大挑战。介绍了一种近期提出的实现红外单光子源的新型机制。该方法以金刚石中的NV-center作为可见光波段的单光子源,利用非相干变频转换实现室温下近红外波段稳定、无闪烁的单光子源。具体的实施方案为在中空芯光子晶体光纤中选择性地填充含有量子点的溶液,以可见光波段的单光子源作为激励源,选择合适的量子点即可得到红外波段的单光子源。中空芯光子晶体光纤保证了较高的单光子吸收效率以及荧光收集效率。该方案的实施在理论上可以达到26%的转换效率,而初步的实验得到了0.1%的转换效率。进一步分析了一些影响转换效率的因素,并提出了一些解决方案。
The NV-center (Nano-Vacancy center) in nano-diamond is the visible light single-photon source with high emissivity and stability at room temperature. How to realize and optimize the infrared single-photon source is the future application of quantum information and quantum communication A big challenge. A new type of mechanism to realize infrared single photon source is introduced. In this method, the NV-center in diamond is used as a single-photon source in the visible light band and a non-flicker single-photon source is achieved by using a non-coherent frequency conversion in the near infrared region at room temperature. In a specific embodiment, a solution containing quantum dots in a hollow core photonic crystal fiber is selectively filled, and a single photon source in the infrared band can be obtained by selecting a suitable quantum dot with a single photon source in the visible wavelength band as an excitation source. Hollow core photonic crystal fibers ensure high single-photon absorption efficiency and fluorescence collection efficiency. The implementation of this scheme can theoretically achieve a conversion efficiency of 26%, while the initial experiment results in a conversion efficiency of 0.1%. Further analysis of some of the factors that affect the conversion efficiency, and put forward some solutions.