Do different kinds of photon-pair sources have the same indistinguishability in quantum silicon photonics?

In the same silicon photonic integrated circuit,we compare two types of integrated degenerate photon-pair sources(microring resonators and waveguides)using Hong–Ou–Mandel(HOM)interference experiments.Two nominally identical microring resonators are coupled to two nominally identical waveguides,which form the arms of a Mach–Zehnder interferometer.This is pumped by two lasers at two different wavelengths to generate,by spontaneous four-wave mixing,degenerate photon pairs.In particular,the microring resonators can be thermally tuned in or out of resonance with the pump wavelengths,thus choosing either the microring resonators or the waveguides as photon-pair sources,respectively.In this way,an on-chip HOM visibility of 94%with microring resonators and 99%with straight waveguides is measured upon filtering.We compare our experimental results with theoretical simulations of the joint spectral intensity and the purity of the degenerate photon pairs.We verify that the visibility is connected to the sources’indistinguishability,which can be quantified by the overlap between the joint spectral amplitudes(JSA)of the photon pairs generated by the two sources.We estimate a JSA overlap of 98%with waveguides and 89%with microring resonators.

A manual acupuncture treatment attenuates common cold and its symptoms: a case series report from South Korea

OBJECTIVE: To investigate beneficial effects of manual acupuncture on common cold periods and its symptoms depended on the difference onset time of common cold, within 36 h or over than that. To prove effects of manual acupuncture on common cold, a retrospective chart review was conducted.METHODS: Chart data for patients with commoncold who were treated with only manual acupuncture with fulfilling Jackson scales and satisfaction at the end of each treatment were collected via multi-centers of Oriental hospitals,Oriental medicine clinics and covalent hospital in South Korea. Totally 187 patients were divided into two groups, Group Ⅰ(115 patients, within 36 h)and Group Ⅱ(72 patients, onset time of cold over than 36 h). Finally 120 patients were observed until entire resolution of cold symptoms.RESULTS: GroupⅠ showed significant decreases themediandurationsofcompletelyrecovery(3 days;95% CI 3.0-4.0) as compared with Group Ⅱ(6 days;95% CI 4.0-7.0, P < 0.001). The manual acupuncture beneficially worked for reduction rate of common cold symptoms by 50% after initial treatment,decreased cold symptoms, and reduced cold duration.CONCLUSION: Manual acupuncture beneficially affected common cold and its symptoms.Moreover it is more susceptibility on the early time of onset cold.