(Feynman diagram calculations rely heavily on perturbation ... increasingly complicated type of SPDC photon scattering. The lowest-order is basic—a pump photon scatters into a pair of lower ...

The effect was first detected by Willis Lamb and Robert Retherford in 1947, with the emitted photon having a frequency ... and it's easiest via Feynman diagrams. "Two-loops" refers to the Feynman ...

It provides an extremely high precision of about 1.2 x 10-4 at a photon energy of around 18.6 keV. Compared to conventional spectrometers, it achieves a signal strength that is four to 22 times ...

Research teams from USTC have realized a high-performance single-photon source with an efficiency beyond the scalable linear optical quantum computing loss tolerance threshold for the first time.

Research teams led by Prof. PAN Jianwei, LU Chaoyang, HU Yongheng, and others have realized a high-performance single-photon source with an efficiency beyond the scalable linear optical quantum ...

while Karlsruhe’s new encryption approach boosts defense against quantum threats. Twente’s new component exchanges photon quantity for quality. Quantum computers are at a tipping point: the tech ...

Sparrow Quantum, a Copenhagen-based startup specializing in single-photon emitters suitable for a range of quantum technology applications, has raised €21.5 million in a series A funding round. Led by ...

China's flagship synchrotron radiation facility, the High Energy Photon Source, has entered its final construction stage as it began the joint-commissioning phase, the Institute of High Energy ...

Heavy duty A high-energy photonic jet (white and blue) blasts through a collapsing star with a black hole at its centre. The cocoon where free neutrons may be available for the r-process is shown in ...