Yksifotonisäteily

Yksifotonisäteily refers to electromagnetic radiation composed of individual photons. Photons are the fundamental particles of light and all other forms of electromagnetic radiation, such as X-rays and gamma rays. Each photon carries a discrete amount of energy, which is inversely proportional to its wavelength. The term "yksifotonisäteily" emphasizes that the radiation is being considered or detected at the level of individual particle interactions, rather than as a continuous wave. This perspective is crucial in quantum mechanics, where the wave-particle duality of light is a fundamental concept. Detecting yksifotonisäteily often requires specialized instruments capable of registering the arrival of single photons, such as photomultiplier tubes or single-photon avalanche diodes. Applications of single-photon detection span various fields, including quantum cryptography, where the presence of an eavesdropper can be detected by the disturbance of single photons, and highly sensitive imaging techniques, such as single-photon emission computed tomography (SPECT) in medical diagnostics. Understanding the properties and detection of yksifotonisäteily is essential for advancements in quantum technologies and fundamental physics research.