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Results tagged with measurements
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user 28512
For questions related to methods, analysis, accuracy, presentation, or interpretation of measurements. It is not intended for abstract quantum measurement questions such as how a wave function collapses during measurement or how the Heisenberg uncertainty principle constrains quantum measurements.
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Can someone explain uncertainty in measurement?
If you're looking at a pointer somewhere in the smallest division, you may be able to tell what half it is in by sight. But you'll have difficulty telling where it is more precisely than that. So the …
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2
votes
Accepted
A seemingly contradictory result about measurements of Bell state with different basis
In terms of the $|\theta\rangle,|\theta+\tfrac{\pi}{2}\rangle$, the $|H\rangle,|V\rangle$ states can be written as
$$|H\rangle=\cos\theta|\theta\rangle-\sin\theta|\theta+\tfrac{\pi}{2}\rangle\\
|V\ran …
- 10.2k
2
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What happens when two entangled particles are not measured synchroneously?
The expectation values of measurements on each photon don't change as a result of measurements on the other photon. …
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0
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How can we measure time?
There is an extensive literature on the topic of simultaneity. Most of this literature has been written by philosophers, but despite this it is quite interesting:
http://plato.stanford.edu/entries/s …
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2
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Accepted
Thought Experiment: Force on magnets in a Stern Gerlach Experiment
The interaction is not a measurement because the probability that it will produce a measurable change in the momentum of the reflecting object is extremely small. The magnet is in a mixed state in whi …
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-1
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Simultaneous measurement for quantum entanglement
It states that if the outcomes of measurements are described by stochastic variables then those variables have to be non-local to reproduce the correlations predicted by quantum mechanics. …
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0
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Why is physics taught as if measurement doesn't affect the thing being measured?
There is an extensive literature on the quantum mechanics of measurement and measurement devices. In this literature the measurement device, the measured system, the environment and the coupling betwe …
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3
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How many worlds are there during branching in the many worlds interpretation?
The many worlds interpretation (MWI) takes quantum mechanics (QM) seriously as a description of how the world works.
A measurement is an interaction that takes information from a system that can be c …
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2
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Is there a maximum accuracy for positions in the universe?
I was thinking how, since an object in our universe can move from one position to another, it must have passed through all the positions between those two positions. (I am thinking it moved it a st …
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0
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Accepted
A quantum entanglement experiment
All the subsequent measurements of this will give the same (+1/2,+1/2) result (supposing the positron is still untouched). … All of the subsequent measurements will give the same result regardless of what has happened to the positron. …
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A non-metaphysical interpretation of measurement in quantum mechanics
The process of measurement is the development of some sort of coherence (I am afraid of using the word entanglement because I do not understand it) between the observed object and the observer. So, …
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0
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Is a quantum gate different from taking a measurement?
An observable is a way of representing some measurable quantity. The observable represents the set of possible outcomes of measuring that quantity. The observables together with the state give you the …
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-1
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How does branching from the many-worlds interpretation come from the assumption of a univers...
The many worlds interpretation of quantum mechanics (MWI) claims that the whole of physical reality is a structure that looks a bit like a collection of parallel universes in some circumstances but in …
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Entangled particles and the Andromeda paradox experiment
Relativistic quantum theories have been invented and used extensively, see books on quantum field theory such as "Quantum Field Theory for the Gifted Amateur" by Lancaster and Blundell. If you have en …
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1
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What is the quantum mechanical definition of a measurement?
A measurement is an interaction that generates a record of some information about a system.
There has traditionally been a lot of controversy about measurement in quantum mechanics. If you just apply …
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