Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Houde, Martin; Rajabi, Fereshteh

doi:10.1088/2399-6528/aad300

J. Phys. Commun.

2018

DOI: 10.1088/2399-6528/aad300

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Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Martin Houde

Fereshteh Rajabi

Abstract: We consider the interaction between distinct superradiance (SR) systems and use the dressed state formalism to solve the case of two interacting two-atom SR samples at resonance. We show that the ensuing entanglement modifies the transition rates and intensities of radiation, as well as introduces a potentially measurable frequency chirp in the SR cascade, the magnitude of which being a function of the separation between the samples. For the dominant SR cascade we find a significant reduction in the duration a… Show more

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Cited by 2 publications

References 35 publications

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Astronomical masers and Dicke’s superradiance

Rajabi

Houde

2020

Monthly Notices of the Royal Astronomical Society

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We consider the radiation properties and processes of a gas with a population inversion using the formalism based on the Maxwell–Bloch equations. We focus on the maser action and Dicke’s superradiance to establish their relationship in the overall radiation process during the temporal evolution of the system as a function of position. We show that the maser action and superradiance are not competing phenomena but are rather complementary and define two distinct limits for the intensity of radiation. Masers characterize the quasi-steady state limit, when the population inversion density and the polarization amplitude vary on time-scales longer than those of non-coherent processes affecting their evolution (e.g. collisions), while superradiance defines the fast transient regime taking place when these conditions are reversed. We show how a transition from a maser regime to superradiance will take place whenever a critical threshold for the column density of the population inversion is reached, at which point a strong level of coherence is established in the system and a powerful burst of radiation can ensue during the transient regime. This critical level also determines the spatial region where a transition from the unsaturated to the saturated maser regimes will take place; superradiance can thus be seen as the intermediary between the two. We also quantify the gain in radiation intensity attained during the superradiance phase relative to the two maser regimes and show how the strong coherence level during superradiance is well suited to explain observations that reveal intense and fast radiation flares in maser-hosting regions.

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Astronomical masers and Dicke’s superradiance

Rajabi

Houde

2020

Monthly Notices of the Royal Astronomical Society

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Triggered superradiance and fast radio bursts

Houde

Rajabi

Gaensler

et al. 2018

Monthly Notices of the Royal Astronomical Society

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In this paper we develop a model for fast radio bursts (FRBs) based on triggered superradiance (SR) and apply it to previously published data of FRB 110220 and FRB 121102. We show how a young pulsar located at ∼ 100 pc or more from an SR/FRB system could initiate the onset of a powerful burst of radiation detectable over cosmological distances. Our models using the OH 2 Π 3/2 (J = 3/2) 1612 MHz and 2 Π 3/2 (J = 5/2) 6030 MHz spectral lines match the light curves well and suggest the entanglement of more than 10 30 initially inverted molecules over lengths of approximately 300 au for a single SR sample. SR also accounts for the observed temporal narrowing of FRB pulses with increasing frequency for FRB 121102, and predicts a scaling of the FRB spectral bandwidth with the frequency of observation, which we found to be consistent with the existing data.

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Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Cited by 2 publications

References 35 publications

Astronomical masers and Dicke’s superradiance

Astronomical masers and Dicke’s superradiance

Triggered superradiance and fast radio bursts

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