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For PET imaging, CT scans are often used for PET attenuation correction and can be acquired at greatly reduced CT radiation dose levels. Techniques as low tube voltage/current have been used to obtain adequate attenuation maps in medium size patients. These techniques usually employ a smooth filter before backprojection to reduce CT image noise which can introduce bias in the conversion from HU to...
In a Monte Carlo simulation, we feedback with conditional measurements and a multiple-step spontaneous parametric downconversion process to generate number-squeezed photonic states with sub-Poissonian variance. A 12 photon state is demonstrated with a success rate of 30%.
We demonstrate a symmetric, single-spatial mode, single-photon heralding efficiency of 84% for a type-II spontaneous parametric downconversion process. High efficiency, single-spatial mode collection is key to enabling many quantum information processing and quantum metrology applications.
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