Towards quantum telescopes: demonstration of a two-photon interferometer for precision astrometry.

Classical optical interferometry requires maintaining live, phase-stable links between telescope stations. This requirement greatly adds to the cost of extending to long baseline separations and limits on baselines will in turn limit the achievable angular resolution. Here we describe a novel type of two-photon interferometer for astrometry, which uses photons from two separate sky sources and does not require an optical link between stations.

Endovascular Plug for Endobronchial Management of an Expectorated Pulmonary Artery Embolization Coil: A Case Report.

Pulmonary artery aneurysms are frequently managed with endovascular embolization. Rare but serious complications of coil embolization are erosion and migration of the coils into the adjacent airways, posing a risk for massive hemoptysis. We report the case of a medically complex patient with a left main pulmonary artery aneurysm treated with coil embolization who ultimately experienced transbronchial migration and expectoration of the coil.