What is Quantum measurement: Definition and 58 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. K

    Exploring the Delayed Quantum Measurement Experiment

    Just thought I would get a couple of opinions from you guys on something I find truly amazing. In Brian Greene's Fabric of the Cosmos he explains how the delayed quantum measurement experiment works. A single photon has already passed through a beam splitter and made the 'choice' of whether...
  2. N

    Quantum measurement projective?

    Homework Statement Have two Greenberger-Horne-Zeilinger (GHZ) states of qubits A, B, C and D, E, F as follows: \mid GHZ \rangle_{ABC} = \frac{1}{\sqrt{2}} \left( \mid 0 \rangle_{A}\mid 0 \rangle_{B}\mid 0 \rangle_{C} + \mid 1 \rangle_{A}\mid 1 \rangle_{B}\mid 1 \rangle_{C}\right) and...
  3. F

    Role of phase in quantum measurement

    Hi, all It is said that, in quantum measurement, the phase do play a wee role, but is that turth?
  4. Loren Booda

    Quantum measurement and prediction

    Does the process of genuine prediction act most readily through quantum mechanics, as opposed to psychically or psychologically? Can observers influence the environment through the action of "quantum prediction" as they do quantum measurement? Does quantum prediction rely on the statistics...
  5. wolram

    Quantum measurement problem paper

    http://arxiv.org/PS_cache/quant-ph/pdf/0506/0506100.pdf Title: A New Ontological View of the Quantum Measurement Problem Authors: Xiaolei Zhang Comments: 37 pages. US Naval Research Lab memorandum report NRL/MR/7218--05-8883, paper to be presented at the Albert Einstein Century conference...
  6. H

    Quantum Measurement: Exploring CNOT and Bell's Theorem

    (Maybe this should go in philosophy? Feel free to move it.) I'm confused. Well, that's probably because I haven't really learned QM properly, except for the basics of Quantum Computing. But still, I'm confused. Why is measurement modeled as a projection, or a "collapse" of a...
  7. G

    The Quantum Measurement Problem and Decoherence

    Hi, I am reading Brian Greene's new book "The Fabric of the Cosmos". In the book, Brian Greene talks about the Quantum Measurement Problem, different interpretations of QM, decoherence, etc... Rather than attributing the collapse of the probability wave to things like conscious or human...
  8. Loren Booda

    Neurophysiology mediates classical and quantum measurement

    In my article "Neurophysiological Uncertainty" on my website http://www.quantumdream.net, I introduce a classical neuronal analog to quantum uncertainty. Here I wish to explore the relative correspondence to the observer by quantum and nonquantum systems. In the quantum system, measurement...
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