What is In quantum mechanics: Definition and 256 Discussions

In quantum physics, a measurement is the testing or manipulation of a physical system in order to yield a numerical result. The predictions that quantum physics makes are in general probabilistic. The mathematical tools for making predictions about what measurement outcomes may occur were developed during the 20th century and make use of linear algebra and functional analysis.
Quantum physics has proven to be an empirical success and to have wide-ranging applicability. However, on a more philosophical level, debates continue about the meaning of the measurement concept.

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  1. J

    Exploring Photons in Quantum Mechanics

    I was just thinking how photons fit into QM, I've heard people speak of "photon wavefunctions". In particular I am wondering whether its bound by the Uncertainty priciple, I guess it can't be... since we know its exact velocity (i.e delta(x) = 0, at least in a 1-d case =P) how could we...
  2. S

    Hidden Variables in Quantum Mechanics

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  3. Loren Booda

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  4. P

    Exploring the Paradox of Time in Quantum Mechanics

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  5. E

    Basic understanding in quantum mechanics for high school

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  6. P

    Why is d<xp>/dt = (i/hbar)<[H,xp]> = 0 for a stationary state?

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