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Results tagged with epr-experiment
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user 28512
A thought experiment initially proposed to argue that the description of physical reality provided by quantum mechanics was incomplete. It involves a pair of particles prepared in an entangled state; if the position of the first particle were measured, the result of measuring the position of the second particle could be immediately predicted.
1
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EPR Paradox resolution: the spin is fixed at creation but its measurement isn't?
Your suggested explanation is that
the electron and positron have opposite but definite spins along an axis, but we can only use probabilities when predicting the outcome of measuring it
So the …
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0
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How do physicists talk about spin of individual particles when the universe is massively ent...
I am going to describe quantum theory without any modifications of quantum equations of motion such as collapse. Quantum theory describes measurable quantities in terms of mathematical doodads called …
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2
votes
Accepted
What is meant by the term "elements of physical reality" used by EPR paper?
The original article by Einstein, Podolsky and Rosen includes the following paragraph:
The elements of the physical reality cannot be determined by a priori philosophical considerations, but must be …
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On Bohr's response to EPR
It is possible that Bohr didn't say quantum mechanics is a statistical theory because that claim is false. The square amplitudes of quantum states don't always obey the rules of probability, e.g. - du …
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What is the local, non-realist explanation of EPR correlations?
In the context of discussing quantum mechanics, realism means that the evolution of a system can be represented by a number or set of numbers, each of which represents the value of some measurable qua …
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Could reducing entanglement by unitary operations allow for FTL-communication? (and why not?)
You write:
So even though we shift the polarization for the upper EPR particle to have the same polarization in both paths of the upper apparatus, the state of the entangled other EPR particle will s …
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Local EPR-experiments with photons in vacuum?
In your diagram, the spacetime interval between B and C is $(x_c-x_b)^2-(t_c-t_b)^2 = 21^2-1^2= 440$. So $B$ is not in the immediate surroundings of $C$, there is a spacelike interval between them. Al …
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How is locality preserved in quantum mechanics?
A quantum system is described by a set of operators called observables. Those observables represent all of the possible outcomes of a particular measurement. When you measure an entangled system, all …
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2
votes
Accepted
Does the many worlds interpretation eliminate the spooky action at a distance paradox?
The MWI explains the EPR experiment without invoking any non-local influences. Each observer measures one particle. The measurement affects only the particle being measured and the measurement device. …
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Quantum entanglement, how do we know there was no spin?
Suppose you have two electrons in a state of entangled spin. Suppose also that you can measure the spin for each electron along one of two axes the x axis or the z axis. Regardless of what axis you ch …
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EPR paradox: instantaneous vs very fast?
The EPR experiment does not imply that the laws of physics are non-local. See
https://arxiv.org/abs/quant-ph/9906007
and
https://arxiv.org/abs/1109.6223.
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The eigenstates of a single EPR particle
There is no non-trivial observable for which the reduced density matrix of one half of an EPR system is an eigenstate. Your candidate observable $|A\rangle\langle A| + |B\rangle\langle B|$ is just the …
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What was the fallacy in EPRs chain of arguments?
A definition of physical reality is given in EPR paper:
The elements of the physical reality cannot be determined by a priori philosophical considerations, but must be found by an appeal to results o …
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Many Worlds locality and EPR experiment
Quantum mechanics can describe the evolution of a physical system in terms of the evolution of its Heisenberg picture observables. The observables of one system $S_1$ only become dependent on those of …
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2
votes
How is information defined when considering locality in quantum mechanics?
Through this example, I understand why information in the form of bits or bit strings could not be communicated instantaneously using entanglement. However, the information about the occurance of a m …
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