Measurement - Definitions and Theories - Quantum Mechanics

Quantum Mechanics

In quantum mechanics, a measurement is an action that determines the location of an object, its momentum, its polarity (if it is a photon), etc. Before a measurement is made, the wavefunction of what is to be measured gives the range of probabilities for the outcomes of measurement, but when a measurement is accomplished that results in what is called the collapse of the wavefunction− at which time there is one definite value rather than a range of possible values. The unambiguous meaning of the measurement problem is an unresolved fundamental problem in quantum mechanics.

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Other articles related to "quantum, quantum mechanics, mechanics":

Jewish Atheists - Formal, Natural and Applied Sciences - Physics
... also made important contributions to quantum electrodynamics, nuclear physics, solid-state physics and astrophysics ... David Bohm (agnostic) - American-born British quantum physicist who contributed to theoretical physics, philosophy of mind, neuropsychology ... his foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922 ...
Superstring Theory - Integrating General Relativity and Quantum Mechanics
... mass objects in fairly large regions of spacetime whereas quantum mechanics is generally reserved for scenarios at the atomic scale (small spacetime regions) ... general relativity predicts a smooth, flowing surface, while quantum mechanics predicts a random, warped surface, neither of which are anywhere near compatible ... small variances, which completely ignores the quantum mechanical predictions of Planck-scale length dimensional warping ...
Leggett–Garg Inequality
... on the state itself, or on the subsequent system dynamics." In quantum mechanics, the Leggett–Garg inequality is violated, meaning that the time evolution of a system cannot be understood classically ... Here quantum entanglement plays the central role ... in the standard Copenhagen Interpretation of quantum mechanics in its various formulations ...
Bohmian - History - De Broglie–Bohm Theory
... After publishing a popular textbook on Quantum Mechanics which adhered entirely to the Copenhagen orthodoxy, Bohm was persuaded by Einstein to take a critical look at von ... The result was 'A Suggested Interpretation of the Quantum Theory in Terms of "Hidden Variables" I and II' ... be disturbances to this, in the way Brownian motion disturbs Newtonian mechanics) ...
Quantum Mechanics - Examples - Harmonic Oscillator
... Main article Quantum harmonic oscillator As in the classical case, the potential for the quantum harmonic oscillator is given by This problem can be solved either by solving the Schrödinger equation directly ...

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    A personality is an indefinite quantum of traits which is subject to constant flux, change, and growth from the birth of the individual in the world to his death. A character, on the other hand, is a fixed and definite quantum of traits which, though it may be interpreted with slight differences from age to age and actor to actor, is nevertheless in its essentials forever fixed.
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