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Results tagged with quantum-mechanics
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user 109928
Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.
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Does QM unequivocally violate the law of bivalence?
There have been attempts to make sense of quantum mechanics by developing a so-called "quantum logic"; this goes back to von Neumann in the thirties.
These approaches are discussed in Quantum Logic …
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0
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Understanding quantum superposition of molecules
One way to understand this (and here I mean just that: one way, not anything backed up by any other consideration than its intuitive plausibility, at least to me) is as follow:
Big molecules in a sup …
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1
answer
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Does spontaneous emission count as a measurement?
It is my understanding that in the density matrix formalism for open quantum systems the environment-induced measurements/collapses/projections are accounted for by the Lindblad superoperator
(from W …
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0
votes
Schrödinger's cat being “both dead and alive”
Schrödinger's cat is a thought experiment about Heisenberg's cut.
The box where the cat and its death-via-decay mechanism live really represents Heisenberg's cut itself. The aim of the cat proposal …
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4
votes
Double slit experiment setup
Basically, I want to know what constitutes a measurement of which slit
a particle goes through in the double slit experiment
Simple: whatever setup you use, if that setup can give you the which …
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2
votes
Accepted
Completeness of quantum mechanics and the EPR paradox
The idea of proposition B is that when observables $P$ and $Q$ do not commute, EPR consider that the observable effectively measured has an "element of reality" as counterpart at the time of measureme …
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1
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What is 'reality' in physics?
There are very strong reasons to think that quantum superposition is a real phenomenon.
What you are proposing is a brand of hidden variable theory, that is the idea that there exists some permanentl …
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2
votes
How are probabilities "physically real"?
As @BobBee rightly points out, the point you make goes down to the whole mathematical structure of QM, and depends on what you mean by "real".
Let's take "real" as labelling the intuitive meaning we …
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1
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Quantum Mechanics Testability
There is a category error in your reasoning.
That a theory is probabilistic in the sense that it explicitely uses and produce probabilities, as quantum mechanics does, does not imply that the theory …
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1
vote
Accepted
Mathematical treatment of electron double slit experiment
You can find an extensive treatment of the double-slit experiment with electrons in Feynman Path Integral approach to electron diffraction for one and two slits, analytical results (Beau, 2012).
The …
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12
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Where to draw the line between quantum mechanics theory and its interpretation(s)?
Interpretations are here to make sense of the formalism of QM. Whatever computations and symbolic manipulations you need to do to prepare and analyse an actual experiment is QM. Whatever conceptual im …
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3
votes
2
answers
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What are "interferences of higher order" in the context of Born rule and triple-slit diffrac...
This question relates to the paper commented in
this 2010 article.
The paper itself is Ruling Out Multi-Order Interference in Quantum Mechanics; it is the discussion of a triple-slit interference ex …
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0
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Einselection locality in decoherence theory
The question is ill-posed in that it assumes that decoherence explains away the measurement problem, in a local manner. However decoherence only says that probability amplitude phases spread from a qu …
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2
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Successor to Copenhagen Interpretation as Orthodox Interpreation of Quantum Mechanics
A 2013 poll involving 33 specialists at a quantum foundations meeting gave 42% for Copenhagen, 28% for information-based interpretations, 18% for Everett.
Only 15% of the specialists thought that the …
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0
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If a quantum state is pure why are its observables still probabilistic?
Technically one cannot say observables are probabilistic, since they are mathematically described by deterministic operators. Now when an observable has different eigenvalues, then the Born rule is us …
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