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Entanglement of photons of different colors

By carefully constructing the geometry of a micron-scale annular resonator, researchers at NIST produced pairs of entangled photons (light particles) that have two very different colors or wavelengths. Light from a pump laser (purple areas in the resonator) produces a photon in each pair at visible wavelength of light (red spots in and around the resonator); The other photon has …

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Astronomers count all photons in the universe. Spoiler Alert: 4,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 photons

Imagine that you are in a boat on a big ocean, the water reaching to the far horizon, with the slightest hints of land immediately behind it. It is morning, just before sunrise, and thick fog has formed along the coast. While the cold holds you to your early watch, you catch a lighthouse that flickers faintly through the fog …

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