All Questions
Tagged with quantum-field-theory quantum-entanglement
73
questions
7
votes
1
answer
369
views
What does this question about entanglement and classical geometry mean?
Below is the question from Andy Strominger's presentation at the String 2014 conference. The question was asked by credible physicist Ashoke Sen as an important question.
"What is the precise ...
- 101
2
votes
2
answers
763
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wave-particle duality and entanglement
By fundamental definition of a entangled system we can say that if we know the quantum state of one subsystem then we can describe the state of another subsystem.
A particle possess wave-particle ...
- 1,125
3
votes
3
answers
326
views
Entanglement in single particle state
Is it possible that we have entanglement in different degrees of freedom of a single particle, like spin and linear momentum?
- 1,125
26
votes
5
answers
7k
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How does QFT help with entanglement?
I'm a bit confused. QFT is claimed to incorporate both Quantum Mechanics and Special Relativity. Therefore it should address the problem of non-locality caused by entanglement. However when I search ...
- 529
1
vote
1
answer
136
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How does one extract the universal part of entanglement entropy?
I want to know how equation 2.11 (page 9) follows from 2.10 (page 8) in this paper.
The two references mentioned just before 2.11 also seem to skip this crucial step. Unless I am missing something ...
- 4,619
4
votes
1
answer
424
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When is entanglement entropy the same as free energy?
I am given the feeling that there exists scenarios when this equality holds.
Can anyone state/refer to the situations?
One case that I hear of is that for $2+1$ CFTs the entanglement entropy across a ...
- 4,619
4
votes
1
answer
2k
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Deriving entanglement entropy from Renyi entropy
My questions are based on this paper - http://arxiv.org/abs/0905.4013
Firstly I want to know as to whether some assumptions are needed about the relationship between the systems $A$ and $B$ for the ...
- 4,619
16
votes
3
answers
11k
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Is it possible for more than two particles to be entangled in a quantum way?
So I know that two particles can be entangled in a quantum way, but is it possible that more than two particles be entangled in a quantum way? Most descriptions provide with two-particles cases, so I ...
- 685
15
votes
1
answer
2k
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Can path integrals be used to understand entanglement?
I like path integrals. I prefer to try to understand quantum phenomena in terms of path integrals rather than Hamiltonian mechanics. However, most of the standard texts on quantum mechanics start from ...
- 633
3
votes
0
answers
222
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Spin polarization of decay products
A relativistic moving particle, e.g. muon $\mu^+$, described by its four-momentum vector $p_\mu$, charge $e$ and with a given spin polarization, ${\bf S}=(S_x,S_y,S_z)$, decays into three particles, e....
- 545
25
votes
4
answers
5k
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Is there an intuitive description of vacuum entanglement?
People often refer to the fact that the vacuum is an entangled state (It's even described as a maximally entangled state).
I was trying to get a feeling for what that really means. The problem is ...
- 16.9k
11
votes
1
answer
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Reduced density matrices for free fermions are thermal
Many recent papers study entanglement in eigenstates of fermionic free hamiltonians (normally on a lattice) using the basic assumption that the reduced density matrices are thermal (e.g. Peschel 2003)....
1
vote
2
answers
740
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Reeh–Schlieder theorem in QFT and entanglement in biological systems
Context: There have been a few papers out recently which mention how photosynthesis in plants might have connections to entanglement, or even perhaps that entanglement is causing photosynthetic ...
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