Phys.org December 3, 2021
Creating entangled photons can be a difficult task requiring a complicated setup as non-classical kinds of light have a small number of photons. In a new scheme researchers at the University of Chicago used two different sources to simultaneously emit photons into a cavity that has an extremely weak nonlinearity. With careful tuning, these sources then cancel each other out with destructive interference—creating a “wall” that blocks photons—once the selected number of photons are captured in the cavity. The basic mechanism can also be applied to all electromagnetic radiation. It can be used to generate and control microwave-frequency photons in a superconducting circuit. This could enable new ways to store and process quantum information. They are examining the system as a potential way to entangle photons, where observation of one photon automatically provides information about the photon it is entangled with, no matter how far apart they are. The work opens the door to for several different platforms, including as a tool for quantum simulation…read more. Open Access TECHNICAL ARTICLE
Fock states with ultraweak nonlinearities… Credit: SCIENCE ADVANCES, 26 Nov 2021,Vol 7, Issue 48