Quantum Temporal Superposition: The Case of Quantum Field Theory.

@article{Henderson2020QuantumTS,
  title={Quantum Temporal Superposition: The Case of Quantum Field Theory.},
  author={Laura J. Henderson and Alessio Belenchia and Esteban Castro-Ruiz and Costantino Budroni and Magdalena Zych and {\vC}aslav Brukner and Robert B. Mann},
  journal={Physical review letters},
  year={2020},
  volume={125 13},
  pages={
          131602
        }
}
Quantum field theory is completely characterized by the field correlations between spacetime points. In turn, some of these can be accessed by locally coupling to the field simple quantum systems, also known as particle detectors. In this letter we consider what happens when a quantum-controlled superposition of detectors at different space-time points is used to probe the correlations of the field. We show that, due to quantum interference effects, two detectors can gain information on field… Expand

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References

SHOWING 1-10 OF 94 REFERENCES
I and i
TLDR
There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality. Expand
Causal orders, quantum circuits and spacetime: distinguishing between definite and superposed causal orders
TLDR
It is shown that every circuit can be immersed into a classical spacetime, preserving the compatibility between the two causal structures, and that the current quantum switch experimental implementations do not feature superpositions of causal orders. Expand
Coherent delocalization in the light-matter interaction
We investigate how the coherent spreading of the center-of-mass wave function of a particle, such as an atom, molecule or ion, affects the particle's interaction with fields such as theExpand
Bell’s theorem for temporal order
TLDR
A thought experiment is considered where a massive body in a spatial superposition leads to entanglement of temporal orders between time-like events, resulting in a violation of a Bell-type inequality. Expand
Communication through quantum-controlled noise
In a recent series of works [Ebler et al., Phys. Rev. Lett. 120, 120502 (2018); arXiv:1809.06655v2; arXiv:1810.10457v2], it has been shown that the quantum superposition of causal order---the quantumExpand
Entangling detectors in anti-de Sitter space
A bstractWe examine in (2+1)-dimensional anti-de Sitter (AdS) space the phenomena of entanglement harvesting — the process in which a pair of detectors (two-level atoms) extract entanglement from aExpand
JHEP 05
  • 178
  • 2019
Nature Commun
  • 10, 3772
  • 2019
Nature Communications 10
  • 1472
  • 2019
Phys
  • Rev. A 99, 062317
  • 2019
...
1
2
3
4
5
...