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Quantum Noise
Quantum noise is noise arising from the indeterminate state of matter in accordance with fundamental principles of quantum mechanics, specifically the uncertainty principle and via zero-point energy fluctuations. Quantum noise is due to the apparently discrete nature of the small quantum constituents such as electrons, as well as the discrete nature of quantum effects, such as photocurrents. Quantified noise is similar to classical noise theory and will not always return an asymmetric spectral density. Shot noise as coined by J. Verdeyen is a form of quantum noise related to the statistics of photon counting, the discrete nature of electrons, and intrinsic noise generation in electronics. In contrast to shot noise, the quantum mechanical uncertainty principle sets a lower limit to a measurement. The uncertainty principle requires any amplifier or detector to have noise. Macroscopic manifestations of quantum phenomena are easily disturbed, so quantum noise is mainly observed i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noise (spectral Phenomenon)
Noise refers to many types of random, troublesome, problematic, or unwanted signals. Acoustic noise may mar aesthetic experience, such as attending a concert hall. It may also be a medical issue inherent in the biology of hearing. In technology, noise is unwanted signals in a device or apparatus, commonly of an electrical nature. The nature of noise is much studied in mathematics and is a prominent topic in statistics. This article provides a survey of specific topics linked to their primary articles. Acoustic noise {{main, Noise In transportation *Aircraft noise * Jet noise, caused by high-velocity jets and turbulent eddies *Noise and vibration on maritime vessels *Noise, vibration, and harshness, quality criteria for vehicles *Traffic noise, including roadway noise and train noise Other acoustic noise * Acoustic noise, technical term for any sound, even deliberate * Artificial noise, in spectator sports * Background noise, in acoustics, any sound other than the monitor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |