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.

9988865Khitrova量子纠缠对于任何量子信息处理提案都有机会所需的量子中继器至关重要。 该项目的目标是获得足以实现量子纠缠的量子煎饼。 “好”意味着具有大偶极矩和辐射主导寿命和退相干时间。 大偶极矩允许人们用真空场或施加的光脉冲比非辐射退相干时间更快地光学控制煎饼。 基于窄线宽 InGaAs/GaAs 量子阱的生长以及辐射宽度和偶极矩的提取，该提案将采取下一步：通过横向限制此类量子阱的 100 至 200 nm 直径部分来制作量子薄饼。 好的煎饼可以用在小型 3D 微腔中，以实现煎饼和光学模式之间的量子纠缠。该方法将从使用传统光学器件以 0.8 微米空间分辨率或使用固体浸没透镜以 0.25 微米分辨率搜索单量子阱的最佳部分开始。 将考虑用于横向限制的各种技术，例如，来自量子阱上方生长的自组织点层的应力或使用紧密聚焦的激光束通过局部加热进行的相互扩散。 候选煎饼将通过多种光学光谱技术进行评估。 不同的反射率或吸收将决定积分吸收和偶极矩。 MHz 分辨率连续波非线性光谱和皮秒泵浦探针测量将用于找出单个光子吸收的影响。 最后，皮秒共振激发后的前向或后向发射的条纹相机检测将显示偏振衰减纯粹辐射的程度。