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Qu'est-ce (qui) est quantum noise - définition
Quantum noise
QUANTUM EFFECT OF UNCERTAINTY
In general, noise is uncontrolled random variation from an expected value and is typically unwanted. General causes are thermal fluctuations, mechanical vibrations, industrial noise, fluctuations of voltage from a power supply, thermal noise due to Brownian motion, instrumentation noise, a laser’s output mode deviating from the desired mode of operation, etc.
Quantum 1/f noise
Quantum 1/f noise is an intrinsic and fundamental part of quantum mechanics. Fighter pilots, photographers, and scientists all appreciate the higher quality of images and signals resulting from the consideration of quantum 1/f noise. Engineers have battled unwanted 1/f noise since 1925, giving it poetic names (such as flicker noise, funkelrauschen, bruit de scintillation, etc.) due to its mysterious nature. The Quantum 1/f noise theory was developed about 50 years later, describing the nature of 1/f noise, allowing it the be explained and calculated via straightforward engineering formulas. It allows for the low-noise optimization of materials, devices and systems of most high-technology applications of modern industry and science. The theory includes the conventional and coherent quantum 1/f effects (Q1/fE). Both effects are combined in a general engineering formula, and present in Q1/f noise, which is itself most of fundamental 1/f noise. The latter is defined as the result of the simultaneous presence
line noise
RANDOM FLUCTUATION IN AN ELECTRICAL SIGNAL
Noise (telecommunications); Random noise; Line noise; Electrical noise; Noise (physics); Noise (electronic); Noise (signal); Electronic noise; Signal noise; Channel noise; Hiss (electronics); Electronic circuit hiss; Coupled noise; Transit-time noise
<communications> 1. Spurious characters due to electrical
noise in a communications link, especially an EIA-232
serial connection. Line noise may be induced by poor
connections, interference or crosstalk from other circuits,
electrical storms, cosmic rays, or (notionally) birds
crapping on the phone wires.
2. Any chunk of data in a file or elsewhere that looks like
the results of electrical line noise.
3. Text that is theoretically a readable text or program
source but employs syntax so bizarre that it looks like line
noise. Yes, there are languages this ugly. The canonical
example is TECO, whose input syntax is often said to be
indistinguishable from line noise. Other non-WYSIWYG
editors, such as Multics "qed" and Unix "ed", in the
hands of a real hacker, also qualify easily, as do
deliberately obfuscated languages such as INTERCAL.
[Jargon File ]
(1994-12-22)
