Quantum cocoon: Diamonds are a physicist's—and perhaps quantum computing's—best friend

Lachlan J. Rogers

Blake C. Stacey

I correct two misapprehensions, one historical and one conceptual, in the recent literature on extensions of the Wigner's Friend thought-experiment. Perhaps fittingly, both concern the accurate description of some quantum physicists' beliefs by others.

John J. L. Morton, J. M. Elzerman

Marko Lončar

Diamond possesses remarkable physical and chemical properties, and in many ways is the ultimate engineering material. For example, it is transparent from the ultra-violet to infrared, has a high refractive index (n = 2.4), strong optical nonlinearity (Kerr and Raman) and a wide variety of light-emitting defects. These properties make diamond a highly desirable material for many applications, including those in quantum and nonlinear photonics, high power optics and optomechanics.

Lilian Childress, Ronald Hanson