Three different experiments demonstrate the distribution of entanglement with a nonentangled carrier. The general scheme is to first initiate three photons or three light beams (A,B,C) in separable states. Alice takes A and C and puts them through a kind of interference process, which creates a correlation between them, but not entanglement. The resulting C is then sent to Bob, who combines it with his B. In the final analysis, A and B are entangled, even though the carrier (C) was never entangled with either.
Nice uh? Yeah, but wrong. It is quite common when you make artistic representations of scientific issues, run the risk, not always consciously, to create confusion in physical concepts, scales, mechanisms, etc… Not a criticism, but I think it is important to consider, especially when speaking of very small scales (nanotechnology, quantum mechanics, particle physics…).
Read more in the source: Why fancy illustrations are so wrong (All That Matters).
Image credit: Andras Kis
Improving the performance of field-effect transistors (FETs) involves reducing the length and thickness of the channel between the source and drain electrodes. Andras Kis and co-workers have made an FET in which the channel is a single layer of MoS2 that is just 0.65 nm thick and 1,500 nm long: the black spheres in this schematic (which is not to scale) are Mo atoms; the yellow spheres are S atoms. The MoS2 layer also has a bandgap, which is crucial for many applications.
This image shows the topography of a sample of artificial kagome spin ice. The ends of the islands have been shaded blue and orange according to the magnetic polarity, and the plus and minus signs denote the net magnetic charge at each three-island vertex. Thermal annealing forms crystallites of magnetic charges of alternating sign.
Credit: Alex David Jerez Roman, Ian Gilbert, and Sheng Zhang
A couple of months ago was announced the launch of the online edition of The Feynman Lectures on Physics Vol. I (mainly mechanics, radiation, and heat). Well, now the Vol. III (quantum mechanics) is available, and Vol. II (mainly electromagnetism and matter) is comming soon. A real jewel at different levels (educational, informative, conceptual …), to have always on hand in your favorites.