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quantum British & World English

A discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents

quantum bit British & World English

The basic unit of information in a quantum computer

quantum dot British & World English

A semiconductor crystal of nanometre dimensions with distinctive conductive properties determined by its size

quantum level British & World English

An energy level in a quantized system.

quantum logic British & World English

A three-valued logic for dealing with the observation and measurement of quantum phenomena (where simultaneous precise measurement of related variables is not necessarily possible), in which the distributive law of Boolean logic (that p and (q or r) implies (p and q) or (p and r)) does not hold.

quantum orbit British & World English

An orbit (of an electron in an atom) defined by a set of quantum numbers.

quantum solid British & World English

A solid that exhibits quantum effects on the macroscopic scale.

quantum suff. British & World English

= quantum sufficit.

quantum well British & World English

A potential well in which electrons and holes are constrained to move in two dimensions only, typically by sandwiching an atomic layer of a semiconductor between layers of a material with a wider band gap, leading to a sharper density of states than in the bulk semiconductor; frequently attributive.

quantum wire British & World English

A wire-like piece of semiconductor in which the movement of electrons is restricted to one dimension, and quantum effects cause their energy of transverse motion (and hence the wire's resistance) to be quantized.

quantum yield British & World English

= quantum efficiency.

quantum jump British & World English

An abrupt transition of an electron, atom, or molecule from one quantum state to another, with the absorption or emission of a quantum

quantum leap British & World English

A sudden large increase or advance

quantum state British & World English

A state of a quantized system which is described by a set of quantum numbers

quantum chemist British & World English

An expert or specialist in quantum chemistry.

quantum defect British & World English

A number representing the degree to which an energy level of an atom with a single valence electron is displaced relative to the corresponding level of the hydrogen atom, being the amount by which the actual principal quantum number of the level exceeds the effective value of the number.

quantum liquid British & World English

A liquid that exhibits quantum effects on the macroscopic scale.

quantum-logical British & World English

Of or relating to quantum logic.

quantum vacuum British & World English

A state devoid of ordinary matter in which virtual particle–antiparticle pairs are continually created and annihilated through quantum fluctuations.

quantum valeat British & World English

For what it is worth; with the understanding that the value or credibility of the statement, testimony, or piece of evidence under discussion may be diminished in consideration of mitigating factors.

quantum gravity British & World English

A theory that attempts to explain gravitational physics in terms of quantum mechanics

quantum meruit British & World English

A reasonable sum of money to be paid for services rendered or work done when the amount due is not stipulated in a legally enforceable contract

quantum number British & World English

A number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values

quantum theory British & World English

A theory of matter and energy based on the concept of quanta, especially quantum mechanics

quantum-chemical British & World English

Of or relating to quantum chemistry.

quantum chemistry British & World English

The branch of physical chemistry concerned with the explanation of chemical phenomena in terms of quantum mechanics.

quantum condition British & World English

A condition resulting from, or forming part of, the application of quantum theory to a system; a condition that selects from the states allowed by classical physics those that are consistent with quantum theory.

quantum-dynamical British & World English

Of or relating to quantum dynamics; quantum-mechanical.

quantum efficiency British & World English

The proportion of incident photons that are effective in causing the photodecomposition of a molecule, the emission of a photoelectron, or a similar photoeffect.

quantum-electronic British & World English

Relating to electronic properties as described or explained by quantum theory (rare);of or relating to quantum electronics.

quantum statistics British & World English

The statistics of the energy distribution of particles when the quantization of energy is taken into account.

quantum sufficit British & World English

To a sufficient extent; moderately, only as much as required. In later use chiefly Science.

quantum theorist British & World English

An expert or specialist in quantum theory.

quantum valebant British & World English

(An action to recover) the reasonable value of goods which have been provided or delivered without a legally enforceable contract stipulating a price.

quantum computer British & World English

A computer which makes use of the quantum states of subatomic particles to store information

quantum mechanics British & World English

The branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave-particle duality, the uncertainty principle, and the correspondence principle

quantum medicine British & World English

A branch of complementary medicine that uses low-dosage electromagnetic radiation in the treatment, diagnosis, and prevention of disease

old quantum theory British & World English

The early form of quantum theory, based on classical mechanics, prior to the development of wave mechanics and matrix mechanics in the mid 1920s.

quantum cryptography British & World English

A technique for the encryption of transmitted information which uses quantum properties (typically the polarization or the entanglement of photons) to construct shared random cryptographic keys in such a way that any interception of the communication channel is revealed by the disturbance it causes to the quantum system.

quantum-electrodynamic British & World English

Of or relating to quantum electrodynamics.

quantum electronics British & World English

The branch of physics concerned with the practical consequences of the quantization of energy states and their interaction with electromagnetic radiation, and especially with the production or amplification of microwaves in crystals.

quantum fluctuation British & World English

A short-lived variation in the amount of energy at a point in space occurring as a result of the uncertainty principle, which allows the law of the conservation of energy to be temporarily violated and very short-lived particles to be spontaneously created and annihilated.

quantum-statistical British & World English

Of or relating to quantum statistics.

quantum teleportation British & World English

A technique exploiting the entanglement of separate quantum systems in which information about a quantum state is transferred to a distant location so that a particle can effectively be recreated there, the original state being destroyed in the process.

quantum-theoretically British & World English

As regards quantum theory, from the point of view of quantum theory.

quantum chromodynamics British & World English

A quantum field theory in which the strong interaction is described in terms of an interaction between quarks mediated by gluons, both quarks and gluons being assigned a quantum number called ‘colour’

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