Einstein's Discoveries Lead to Gravitational Laser

Einstein’s work was crucial for the current understanding of gravitational waves and the development of stimulated radiation that culminated in the invention of lasers. Dr Jing Liu, from the University of Chinese Academy of Sciences, has combined the two into an intriguing proposal: it is possible to create the gravitational equivalent of a laser.

Let’s start with the basics. The word laser stands for Light Amplification by Stimulated Emission of Radiation. A laser is made of light all with roughly the same frequency (or, in other words, it is monochrome) and it is coherent, so it can be focused to a tight spot or can be used to create ultrashort pulses. By stimulating a quantum mechanical energy transition, it is possible to get light out all with the same frequency.

Natural lasers exist and they are called masers – with the "m" standing for microwaves. These astrophysical masers come from a bunch of sources, including comets, stellar atmosphere, and even the aurorae of Jupiter. So if light can make a laser, could gravity as well?   READ MORE...

Manipulating Quantum Light

Albert Einstein's stimulated emission theory has been validated by large amounts of light, but never before by individual photons.

New research offers the ability to manipulate and identify single photons, allowing for the manipulation of quantum light.

Continued development of this technology has the potential to lead to huge advancements in quantum computing.

Scientists stand ready to manipulate quantum light, just as Albert Einstein envisioned in 1916.  Researchers from the University of Sydney and the University of Basel successfully managed to manipulate and identify small numbers of interacting photons—packets of light energy. According to the team, this work represents an unprecedented landmark development for quantum technologies.

Stimulated light emission—a theory first proposed by Einstein in 1916 that helps explain how photons can trigger atoms to emit other photons—laid the basis for the invention of the laser (Light Amplification by Stimulated Emission of Radiation). 

It’s long been understood for large numbers of photons, but this new research has allowed scientists to both observe and effect stimulated emission for single photons for the first time. Researchers measured the direct time delay between one photon and a pair of bound photons scattering off a single quantum dot, a type of artificially created atom.  READ MORE...