Publications by authors named "Patrick F Poitras"
Article Synopsis
- The study investigates the use of laser absorption spectroscopy (LAS) to analyze exhaled breath samples for early detection of SARS-CoV-2 in patients with COVID-19 pneumonia, addressing the limitations of RT-PCR testing.
- A total of 135 patients were enrolled, and breath samples were analyzed, achieving an accuracy of 72.2%-81.7% in distinguishing between SARS-CoV-2 positive and negative cases, outperforming traditional VOC models.
- The findings suggest that this ML-based breathprint method is a promising, non-invasive diagnostic tool that can be easily implemented, enhancing early detection and treatment of respiratory pathogens.
Heralded single photon sources are often implemented using spontaneous parametric downconversion, but their quality can be restricted by optical loss, double pair emission and detector dark counts. Here, we propose a scheme using cascaded downconversion that would improve the performance of such sources by providing a second trigger signal to herald the presence of a single photon, thereby reducing the effects of detector dark counts. Our calculations show that for a setup with fixed detectors, an improved heralded second-order correlation function g can be achieved with cascaded downconversion given sufficient efficiency for the second downconversion, even for equal single-photon production rates.
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