QUANTUM PANCAKES FOR QUANTUM ENTANGLEMENT

量子纠缠的量子煎饼

• 批准号: 9988865
• 负责人: Galina Khitrova
• 金额: $ 22万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9988865&HistoricalAwards=false
• 关键词: QUANTUM; PANCAKES; ENTANGLEMENT

9988865KhitrovaQuantum entanglement is essential for quantum repeaters needed for any of the proposals for quantum information processing to have a chance. The goal of this project is to obtain a quantum pancake that is good enough to achieve quantum entanglement. "Good" means one with a large dipole moment and radiatively dominated lifetime and decoherence time. A large dipole moment allows one to optically control the pancake with the vacuum field or an applied optical pulse faster than nonradiative decoherence times. Based on the growth of narrow-linewidth InGaAs/GaAs quantum wells and extraction of the radiative width and dipole moment, this proposal would take the next step: make a quantum pancake by laterally confining a 100- to 200-nm diameter portion of such a quantum well. A good pancake could be used in a small 3D microcavity to achieve quantum entanglement between a transition of the pancake and the optical mode.The approach will begin with a search for the best portions of a single quantum well with 0.8-micron spatial resolution using conventional optics or 0.25-micron resolution with a solid immersion lens. Various techniques for lateral confinement will be considered, for example, stress from a layer of self-organized dots grown above the quantum well or interdiffusion by local heating using a tightly focused laser beam. Candidate pancakes will be evaluated by a multitude of optical spectroscopic techniques. Differential reflectivity or absorption will determine the integrated absorption and dipole moment. MHz-resolution cw nonlinear spectroscopy and picosecond pump-probe measurements will be used to find out the effect of absorption of a single photon. Finally, streak-camera detection of the forward or backward emission following picosecond resonant excitation will show to what extent the polarization decay is purely radiative.

998865khitrovaquantum纠缠对于任何量子信息处理所需的量子中继器都是必不可少的。 该项目的目的是获得足以实现量子纠缠的量子煎饼。 “好”是指具有较大的偶极矩，并且辐射主导的寿命和腐烂时间。 一个大偶极矩使一个人可以通过真空场进行光学控制煎饼，或者比非辐射分解时间更快地使用光脉冲。 基于窄线宽INGAAS/GAAS量子井的生长以及辐射宽度和偶极矩的提取，该建议将采取下一步：通过横向限制此类量子孔的100至200 nm直径部分，制作量子煎饼。 一个好的煎饼可以在小的3D微腔中使用，以实现煎饼过渡和光学模式之间的量子纠缠。该方法将开始在使用常规光学器件或0.25微分辨率的0.25微米分辨率的情况下搜索单个量子的最佳部分，并使用固体沉浸式镜头进行固定。 将考虑各种用于横向限制的技术，例如，使用紧密聚焦的激光束从量子井上生长的自组织点或通过局部加热而生长的自组织的应力。 候选煎饼将通过多种光谱技术进行评估。 差异反射率或吸收将确定综合吸收和偶极矩。 MHz分辨率的CW非线性光谱和Picsecond泵杆测量将用于找出吸收单个光子的效果。 最后，在皮秒共振激发后对前向或向后发射的条纹相机检测将在多大程度上纯粹是辐射的。