quantum


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Related to quantum: quantum physics, quantum theory, Quantum computing, Quantum numbers

quantum

 [kwon´tum] (L.)
an elemental unit of energy; the amount emitted or absorbed at each step when energy is emitted or absorbed by atoms or molecules.

quan·tum

, pl.

quan·ta

(kwahn'tŭm, -tă),
1. A unit of radiant energy (Q) varying according to the frequency (ν) of the radiation.
2. A certain definite amount.
[L. how much]

quantum

/quan·tum/ (kwon´tum) pl. quan´ta   [L.] a unit of measure under the quantum theory (q.v.).

quan·tum

, pl. quanta (kwahn'tŭm, -tǎ)
1. A unit of radiant energy (ε) varying according to the frequency (ν) of the radiation.
2. A certain definite amount.
[L. how much]

quantum

  1. a quantity or amount.
  2. the minimum quantity in which a neurotransmitter is secreted.
  3. a unit of light.

photon 

The basic unit of radiant energy defined by the equation
E = hν
where h is Planck's constant (6.62 ✕ 10−34 joule ✕ second), ν the frequency of the light and E the energy difference carried away by the emission of a single photon of light. The term photon usually refers to visible light whereas the term quantum refers to other electromagnetic radiations. See quantum theory; wave theory; troland.

quan·tum

, pl. quanta (kwahn'tŭm, -tǎ)
Unit of radiant energy (Q) varying by frequency (ν) of radiation.
[L. how much]

quantum (kwon´təm),

n a discrete unit of electromagnetic energy or of a roentgen. A quantity becomes quantized when its magnitude is restricted to a discrete set of values as opposed to a continuous set of values.
quantum theory,

quantum

pl. quanta [L.] an elemental unit of energy; the amount emitted or absorbed at each step when energy is emitted or absorbed by atoms or molecules.

quantum theory
radiation and absorption of energy occur in quantities (quanta) which vary in size with the frequency of the radiation.
References in periodicals archive ?
Comparison of this model with the experimental data shows that: 1) the lowest quantum state population ([[beta].
Last year, Freedman and Kitaev, together with mathematicians Zhenghan Wang and Michael Larsen of Indiana University in Bloomington, proved that a topological quantum computer would be every bit as effective as another theoretical quantum computer, the "qubit" quantum computer, which employs quantum physics but uses it in a very different way (SN: 2/1/03, p.
But, alas, quantum consciousness has about as much substance as the aether from which it is composed.
These three papers clearly represent a milestone in the biological applications" of quantum dots, says Nie.
Already close to realization are communications systems secured against eavesdropping by means of certain less-exotic features of quantum mechanics (SN: 6/17/00, p.
Quantum thrives on providing event-based marketing support for businesses and organizations which allows them to reach more audiences by creating a unique synergy between their partners and the communities they serve.
Quantum dots are also made from semiconductors and, in many ways, behave like the semiconductors in conventional solar cells.
Artur Ekert is the Leigh Trapnell Professor of Quantum Physics at the Department of Applied Mathematics and Theoretical Physics (DAMTP), University of Cambridge.
David Deutsch and Artur Ekert of the University of Oxford in England have considered how a chess-playing quantum computer would use Grover's procedure.
Our customers are demanding security solutions for their heterogeneous storage environments and we wanted to provide them with a range of products which could meet their diverse needs," said Rob Pickell, vice president of worldwide marketing for Quantum.
One could imagine a quantum Internet in the future," he says.