All Questions
Tagged with quantum-field-theory quantum-entanglement
22
questions with no upvoted or accepted answers
8
votes
0
answers
259
views
The emergence of space-time from entangled states
I recently read an article by Yasunori Nomura (https://arxiv.org/abs/1711.05263), in which he says that space-time is an emerging phenomenon. At the same time, space-time disappears when the ...
- 956
6
votes
0
answers
92
views
Can we determine when the lowest-energy state cannot be annihilated by any local operator, just by inspection of the Hamiltonian?
Relativistic quantum field theory (QFT) has the property that the lowest-energy state cannot be annihilated by any operator that is localized in a finite region of space (references 1,2,3). In other ...
- 54.5k
4
votes
0
answers
128
views
Entanglement entropy in states with particle content
I am studying entanglement and its measurements in the context of a lattice model of the Dirac theory. The idea is that one has two bands, symmetric with respect to $E=0$, and the groundstate is ...
- 503
4
votes
0
answers
293
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QFT: the origin of vacuum correlation
My question is about the origin (or mechanism?) of vacuum correlation.
In quantum field theory in flat spacetime, a free scalar field has the following two-point correlation function at the same ...
- 103
4
votes
0
answers
350
views
What is the relationship between spin network spacetime and tensor network (entanglement) spacetime?
In 1971, Sir Roger Penrose, suggested a combinatorial construction of spacetime using the angular momentum of particles. This work led to and introduced the idea of spin networks which are ...
- 425
3
votes
0
answers
103
views
Decoherence time of quarks
I have been reading papers on using top quark's use as a probe for new physics using quantum information theoretic observables such as concurrence. One of the reasons they provide for using a top ...
- 309
3
votes
0
answers
87
views
Is Von Neumann entropy in QFT related to the two-point function?
Suppose I have a scalar QFT. Is the Von Neumann entropy related to the two point function? More generally, given the two point function and an entangling surface, can we calculate the Von Neumann ...
- 672
3
votes
0
answers
96
views
Is it possible to peform thermodynamic work by harvesting entanglement from the vacuum?
I have already asked two questions on this topic:
1. What happens to the vacuum when entanglement is harvested? [closed]
and
2. Does entanglement harvesting require cooling the environment to ...
- 1,488
3
votes
0
answers
222
views
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
2
votes
0
answers
126
views
Why does the no-cloning theorem imply the monogamy of entanglement?
I have seen papers where they mentioned that the monogamy of entanglement can be seen as a consequence of the no-cloning theorem. Could somebody sketch this out?
N.B.: I have seen the argument that ...
- 1,544
2
votes
1
answer
79
views
Critical parameter for 1D quantum system corresponding to $T_c$ of 2D Classical model
Utilizing the fact that there is a correspondence between a $d$ dimensional quantum system and a $d+1$ dimensional classical system (c.f. Trotter Decomposition), my question regards what the critical ...
- 3,710
1
vote
1
answer
130
views
Does the no signalling theorem in quantum mechanics beg the question?
I had always thought similarly and then came across a paper here that argues this.
The abstract is as follows:
Many authors state that quantum nonlocality could not involve any controllable ...
1
vote
0
answers
45
views
Resource Recommendation for Quantum Information Theory especially entanglement in quantum field theory
I am trying to start learning quantum information from a theoretical point of view not involving aspects of quantum computing. The main thing that I want to understand is entanglement from both a ...
1
vote
0
answers
51
views
How is entanglement of non-spin variables incompatible with local realism?
It seems to me that spin/polarization entanglement is the only spooky one. That's because the entanglement of other observables would happen even in regular classical physics if we made a "...
- 2,475
1
vote
0
answers
102
views
Hamiltonian basis in multiple particle systems
I have a question about the choosing of basis that compose the Hamiltonian of multiple systems. For example if we have a system of N particles, that depend in our case of Pauli matrixes i will give ...
- 529