Artículos con la etiqueta ‘Fotones’

Records The Shape of a Single Photon Unveiled in China

Por • 17 may, 2013 • Category: Opinion

The ability to store and release single photons is one of the enabling technologies for a quantum internet. These quantum storage devices are the key to quantum routers. Clearly, memories that can preserve the spatial structure of the photons will make this kind of router, and the internet it empowers, far more flexible and capable. Of course, the technologies that end up making the quantum internet of the future will depend on many other factors, not least of which will be a significant dollop of luck. But given the numerous advances in this area made by Chinese labs in recent years, only a fool would bet against Chinese technology playing a significant role in the way we quantum communicate in future

The quantum vacuum as the origin of the speed of light

Por • 3 mar, 2013 • Category: Crítica

We show that the vacuum permeability and permittivity may originate from the magnetization and the polarization of continuously appearing and disappearing fermion pairs. We then show that if we simply model the propagation of the photon in vacuum as a series of transient captures within these ephemeral pairs, we can derive a finite photon velocity. Requiring that this velocity is equal to the speed of light constrains our model of vacuum. Within this approach, the propagation of a photon is a statistical process at scales much larger than the Planck scale. Therefore we expect its time of flight to fluctuate. We propose an experimental test of this prediction.