Questions tagged [epr-experiment]
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.
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EPR effect, non-locality, positivism and realism
In the framework of EPRB experiments, has an experimental verification been performed of the conservation of 2-time correlations of Bob's photons polarization despite Alice's polarization measurements?...
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How are realism, determinism, counter factual definiteness and non-contextuality related?
I have come across these terms when trying to understand the EPR paradox and its resolution. I have found that they are often used interchangeably, but when I look up their official definitions, I ...
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How is information defined when considering locality in quantum mechanics?
$\newcommand{\ket}[1]{|#1\rangle}$
My question is a follow-up from this discussion about the presence of non-local correlations in a theory that is deemed local. The first answer talks about the ...
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Could reducing entanglement by unitary operations allow for FTL-communication? (and why not?)
About the closure: This Question is about why manipulating 1 particle of an entangled pair unitarily can’t cause measurable consequences on the other and how this manifests in the concretely described ...
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How do physicists talk about spin of individual particles when the universe is massively entangled?
The following two things seem to be true:
(1) The universe is massively entangled because the wave function that describes the entire universe has measure 1 of being entangled. Further, given how ...
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Mermin's EPR paradox explanation [closed]
I am reading N. D. Mermin, Bringing home the atomic world: Quantum mysteries for anybody
. The main part of the article is pretty clear to me. But I am not sure how quantum mechanics described in ...
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Precise formulation of the ER = EPR conjecture
Maldacena and Susskind have "formulated" the now famous ER = EPR conjecture in their paper Cool horizons for entangled black holes, but as of today, I have not find a quantum theorist who ...
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What was the fallacy in EPRs chain of arguments?
Let's say, there is an entangled system of two electrons with opposite spins; The joint system is in a state of eigenvectors for z-Spin ( $S_z$) with both particles far away from each other:
$$|\Psi\...
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Two-mode squeezing and EPR
Consider the two-mode squeezing operator $S(\xi)=\exp\left(\xi\hat{a}^{\dagger}\hat{b}^{\dagger}-\xi^*\hat{a}\hat{b} \right)$ with $\xi=r\exp(\text{i}\phi)$, and assume that the initial state of the ...
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In observing EPR phenomenon, which direction is opposite to the other?
I have a question about the EPR phenomenon of the quantum-mechanics.
When you observe the EPR phenomenon, you separate two spins in the singlet state. Then, you and your fellow independently observe ...
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Is there any minimalistic version of superdeterminism theory?
Superdeterminism is one wild conjecture which is an alternative to the standard quantum mechanical interpretation and preserves local realism
Superdeterminism seems to be too much of a stretch. If ...
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Is the possible Bell's test loophole of entangled particles communicating at a non instantaneous but FTL speed addressed and eliminated? [closed]
TLDR:
There seems to be a loophole in Bell's test that is not addressed or eliminated before we can successfully conclude that it proves that the Universe is unreal and non local. The entangled ...
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How can we be sure Bell's theorem disproves local realism when we are not sure whether the measuring apparatus is in some form of entanglement or not? [duplicate]
Bell's therorem seems to disprove localism because measuring, let's say spin of an entangled electron, seem to communicate the measurement to it's another pair instantaneously.
But isn't another thing ...
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The eigenstates of a single EPR particle
I am curious whether there is a sense in which each of the EPR particles is in an eigenstate of some observable.
Consider a pair of EPR particles 1 and 2, of which combined state is given by
$|\Psi\...
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Is the ER=EPR conjecture a loophole in Bell's theorem that would allow for local realism to hold?
Specifically, if it turned out the mechanism for quantum entanglement is that all particles are somehow connected to each other via wormholes (assuming that is what the conjecture actually says), it ...
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