Fibre-based entangled photon sources for practical quantum application

用于实际量子应用的基于光纤的纠缠光子源

• 批准号: 293244-2009
• 负责人: Qian, Li
• 金额: $ 2.77万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=505610
• 关键词: Fibre; based; entangled; photon; sources

We propose to develop a fibre-optic device that generates entangled photon pairs for practical applications of quantum technology. Entangled photons, broadly speaking, are pairs of photons (or light "particles") prepared in a special state that makes them exhibit correlated properties. For example, for polarization-entangled photon pairs, the measurement of one photon's polarization state reveals that of its partner, even when they are physically far away from each other -- a phenomenon described by Einstein as "spooky action at a distance". Entanglement can be exploited by quantum computing and quantum communication. Entanglement-based quantum key distribution (QKD), for example, utilizes the correlation of the photons sent to two remote parties and allows them to share a common set of random cryptographic keys. It guarantees the security of the keys since any eavesdropping attempt would result in a detectable deterioration of correlation. Entanglement can also be used in metrology, such as quantum optical coherent tomography, quantum lithography, and entangled-photon microscopy. These applications utilize the non-classical correlations of the photon pairs to enhance temporal and spectral resolutions as well as signal-to-noise ratios in imaging and metrology.

我们建议开发一种产生纠缠光子对的光纤器件，用于量子技术的实际应用。广义地说，纠缠光子是在一种特殊状态下制备的光子对(或光“粒子”)，这种状态使它们显示出相关的性质。例如，对于偏振纠缠的光子对，测量一个光子的偏振状态就会揭示出它的伙伴的偏振状态，即使它们在物理上彼此相距很远--爱因斯坦将这种现象描述为“远距离的幽灵作用”。纠缠可以被量子计算和量子通信所利用。例如，基于纠缠的量子密钥分发(QKD)利用发送给两个远程方的光子的相关性，并允许它们共享一组公共的随机密钥。它保证了密钥的安全性，因为任何窃听尝试都会导致可检测到的相关性恶化。纠缠还可以用于计量，如量子光学相干层析、量子光刻和纠缠光子显微镜。这些应用利用光子对的非经典关联来提高时间和光谱分辨率以及成像和计量中的信噪比。