Causal Modeling the Delayed-Choice Experiment.

Wave-particle duality has become one of the flagships of quantum mechanics. This counterintuitive concept is highlighted in a delayed-choice experiment, where the experimental setup that reveals either the particle or wave nature of a quantum system is decided after the system has entered the apparatus. Here we consider delayed-choice experiments from the perspective of device-independent causal models and show their equivalence to a prepare-and-measure scenario.

Experimental test of photonic entanglement in accelerated reference frames.

The unification of the theory of relativity and quantum mechanics is a long-standing challenge in contemporary physics. Experimental techniques in quantum optics have only recently reached the maturity required for the investigation of quantum systems under the influence of non-inertial motion, such as being held at rest in gravitational fields, or subjected to uniform accelerations. Here, we report on experiments in which a genuine quantum state of an entangled photon pair is exposed to a series of different accelerations.

Kaposi sarcoma with upper airway obstruction and bilateral chylothoraces.

A 3-year-old boy infected with HIV presented with progressive dyspnea and upper airway obstruction necessitating airway stenting. Chest radiography revealed bilateral alveolar opacification and chylothoraces. Post,mortem examination confirmed disseminated Kaposi sarcoma with infiltration of the thoracic duct.