Origin of Quantum Noise
Quantum noise may appear in any system where conventional sources of noise (industrial noise, vibrations, fluctuations of voltage in the electric power supply, thermal noise due to Brownian motion, etc.) are somehow suppressed. Generally, quantum noise can be considered as error of description of any physical system within classical (not quantum) theory. In an electric circuit, the random fluctuations of a signal due to discrete character of electrons can be called quantum noise. The random error of interferometric measurement of position due to discrete character of photons registered can be attributed to quantum noise. Even the uncertainty of position of a probe in probe microscopy may lead to quantum noise although this is not the dominant mechanism that determines the resolution of such a device. In most cases, quantum noise refers to the fluctuations of signal in extremely accurate optical systems with stabilized lasers and efficient detectors.
Read more about this topic: Quantum Noise
Famous quotes containing the words origin of, origin, quantum and/or noise:
“The origin of storms is not in clouds,
our lightning strikes when the earth rises,
spillways free authentic power:
dead John Brown’s body walking from a tunnel
to break the armored and concluded mind.”
—Muriel Rukeyser (1913–1980)
“Each structure and institution here was so primitive that you could at once refer it to its source; but our buildings commonly suggest neither their origin nor their purpose.”
—Henry David Thoreau (1817–1862)
“The receipt to make a speaker, and an applauded one too, is short and easy.—Take of common sense quantum sufficit, add a little application to the rules and orders of the House, throw obvious thoughts in a new light, and make up the whole with a large quantity of purity, correctness, and elegancy of style.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“Speak, ye that ride on white asses, ye that sit in judgment, and walk by the way.
They that are delivered from the noise of archers in the places of
drawing water, there shall they rehearse the righteous acts of the
Lord,”
—Bible: Hebrew Judges (l. V, 10–11)