Faster-than-light signaling in the rotating-wave approximation

Funai, Nicholas; Martín-Martínez, Eduardo

doi:10.1103/physrevd.100.065021

Cited by 28 publications

(15 citation statements)

References 24 publications

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“…For the discussion on the switching it is relevant to note that in quantum optics we often have intuition that comes from applying single-mode and rotating-wave approximations. Together, these approximations are consistent with taking the limit of long interaction times (for a more nuanced discussion check, e.g., [31]). It is therefore convenient and useful to compare both linear and quadratic models within this long interaction regime.…”

Section: B Linear Coupling: Transition Probability In Arbitrary Dimen...supporting

confidence: 75%

What makes a particle detector click

Tjoa,

Gutiérrez,

Sachs

et al. 2021

Preprint

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We highlight fundamental differences in the models of light-matter interaction between the behaviour of Fock state detection in free space versus optical cavities. To do so, we study the phenomenon of resonance of detectors with Fock wavepackets as a function of their degree of monochromaticity, the number of spatial dimensions, the linear or quadratic nature of the light-matter coupling, and the presence (or absence) of cavity walls in space. In doing so we show that intuition coming from quantum optics in cavities does not straightforwardly carry to the free space case. For example, in (3 + 1) dimensions the detector response to a Fock wavepacket will go to zero as the wavepacket is made more and more monochromatic and in coincidence with the detector's resonant frequency. This is so even though the energy of the free-space wavepacket goes to the expected finite value of Ω in the monochromatic limit. This is in contrast to the behaviour of the light-matter interaction in a cavity (even a large one) where the probability of absorbing a Fock quantum is maximized when the quantum is more monochromatic at the detector's resonance frequency. We trace this crucial difference to the fact that monochromatic Fock states are not normalizable in the continuum, thus physical Fock states need to be constructed out of normalizable wavepackets whose energy density goes to zero in the monochromatic limit as they get spatially delocalized.

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Section: B Linear Coupling: Transition Probability In Arbitrary Dimen...supporting

confidence: 75%

What makes a particle detector click

Tjoa,

Gutiérrez,

Sachs

et al. 2021

Preprint

Self Cite

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show abstract

“…However, this is not as simple when considering systems of several detectors, where the covariant formulation becomes especially crucial. This is the case in various problems of interest to the field of relativistic information such as e.g., entanglement harvesting or classical and quantum communication through quantum fields [9,[32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

General relativistic quantum optics: Finite-size particle detector models in curved spacetimes

2020

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We propose a fully covariant model for smeared particle detectors in quantum field theory in curved spacetimes. We show how effects related to accelerated motion of the detector and the curvature of spacetime influence the way different observers assign an interaction Hamiltonian between the detector and the field. The fully covariant formulation explicitly leaves the physical predictions of the theory invariant under general coordinate transformations, hence providing a description of particle detector models (e.g., Unruh-DeWitt detectors, models for the light-matter interaction, etc) that is suitable for arbitrary trajectories in general spacetime backgrounds.

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“…Indeed, an atom dipolarly coupled to the electromagnetic field can accurately be described with a particle detector model for the second-quantized electromagnetic field, capturing the fundamental features of the interaction of matter and light [14,16,17]. Moreover, In relativistic quantum information, particle detectors have also seen many uses, for example in modeling classical and quantum communication through quantum fields [17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Duality in the dynamics of Unruh-DeWitt detectors in conformally related spacetimes

et al. 2020

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We prove a nonperturbative duality concerning the dynamics of harmonic-oscillator-type Unruh-DeWitt detectors in curved spacetimes. Concretely, using the Takagi transformation we show that the action of a harmonic oscillator Unruh-DeWitt detector with one frequency in a spacetime is equal to that of a detector with a different frequency in a conformally related spacetime. As an example, we show that the dynamics of simple stationary detectors in flat spacetime is dual to that of detectors in a cosmological scenario. The nonperturbative duality enables us to investigate entanglement harvesting in new scenarios in curved spacetime by using results obtained in simpler, conformally related spacetimes.

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Faster-than-light signaling in the rotating-wave approximation

Cited by 28 publications

References 24 publications

What makes a particle detector click

What makes a particle detector click

General relativistic quantum optics: Finite-size particle detector models in curved spacetimes

Duality in the dynamics of Unruh-DeWitt detectors in conformally related spacetimes

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