Initiation of Superradiance from Different Collective Spin States

• URL: http://arxiv.org/abs/2606.14949v1
• Date: Fri, 12 Jun 2026 20:46:11 GMT
• Title: Initiation of Superradiance from Different Collective Spin States
• Abstract summary: Superradiance is an extensive cooperative spontaneous emission phenomenon.<n>We present results on the superradiant dynamics of a representative selection of Dicke states.<n>For large N, we are able to predict fairly accurately the pulse profile in each case using the mean field approximation.
• Score: 5.538344988256996
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Superradiance is an extensive cooperative spontaneous emission phenomenon. Some atomic collective spin states exhibit it. However, distinct initial states differ in their decay dynamics. Dicke states with different numbers of excitations have their peak emission intensity shifted in time depending on the number of excitations. Emission intensity in atomic coherent states depends on their polarization. Some specific states undergo a squeezing controlled crossover, making the emission character dependent on the amount of squeezing in the state. We present detailed results on the superradiant dynamics of a representative selection of Dicke states. For large N, we are able to predict fairly accurately the pulse profile in each case using the mean field approximation, an approach based on the Fokker Planck Equation. We also present results on the intensity correlation function of the emission.

Related papers

• Extensive mixed-state entanglement in kinetically constrained superradiance [0.0]
  Dicke superradiance by an ensemble of quantum emitters produces a collective burst of radiation, but no entanglement in the mixed state of the emitters.<n>We show that adding a local kinetic constraint between the emitters generates extensive mixed-state entanglement.<n>Our results offer a general framework and experimentally viable approach for the dissipative engineering of entangled dark states enhanced by superradiance.
  arXiv  Detail & Related papers  (2026-05-15T16:14:51Z)
• Persistent subradiant correlations in a random driven Dicke model [49.1574468325115]
  We study theoretically the driven-dissipative dynamics of an array of two-level emitters, coupled to a single photonic mode, in the presence of disorder in the resonant frequencies.<n>We introduce the notion of subradiant correlations in the dynamics, corresponding to the eigenstates of the Liouvillian with a low decay rate, that can also oscillate in time.
  arXiv  Detail & Related papers  (2025-07-25T17:53:56Z)
• Production and stabilization of a spin mixture of ultracold dipolar Bose gases [39.58317527488534]
  We present experimental results for a mixture composed of the two lowest Zeeman states of $162$Dy atoms.<n>Due to an interference phenomenon, the rate for such inelastic processes is dramatically reduced with respect to the Wigner threshold law.
  arXiv  Detail & Related papers  (2024-07-11T17:37:01Z)
• Relaxation of maximally entangled quantum states of two nonequivalent nuclear spins in a liquid [49.1574468325115]
  We investigate the relaxation of pseudo-pure maximally entangled states (Bell states) of two nuclear spins 1H-13C belonging to a molecule in a liquid. Our relaxation measurements reveal different relaxation rates for different Bell states.
  arXiv  Detail & Related papers  (2024-03-06T18:34:24Z)
• Breakdown of steady-state superradiance in extended driven atomic arrays [0.0]
  We show how light-shifts and decay rates induced by dipole-dipole interactions modify the steady-state properties of coherently driven arrays of quantum emitters. We find that diverging from the well-established Dicke paradigm of equal all-to-all interactions significantly modifies the emission properties.
  arXiv  Detail & Related papers  (2023-11-17T19:04:14Z)
• $N$ Scaling of Large-Sample Collective Decay in Inhomogeneous Ensembles [44.99833362998488]
  We experimentally study collective decay of an extended disordered ensemble of $N$ atoms inside a hollow-core fiber. We observe up to $300$-fold enhanced decay rates, strong optical bursts and a coherent ringing.
  arXiv  Detail & Related papers  (2023-07-21T14:43:29Z)
• Correlated steady states and Raman lasing in continuously pumped and probed atomic ensembles [68.8204255655161]
  We consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser.
  arXiv  Detail & Related papers  (2022-05-10T06:54:54Z)
• From superradiance to subradiance: exploring the many-body Dicke ladder [0.0]
  We report a time-resolved study of collective emission in dense ensembles of two-level atoms. We compare the build-up of superradiance and subradiance from the ensemble when driven by a strong laser.
  arXiv  Detail & Related papers  (2021-12-20T15:50:05Z)
• Dispersive readout of molecular spin qudits [68.8204255655161]
  We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states. We derive an expression for the output modes in the dispersive regime of operation. We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
  arXiv  Detail & Related papers  (2021-09-29T18:00:09Z)
• Dimerization of many-body subradiant states in waveguide quantum electrodynamics [137.6408511310322]
  We study theoretically subradiant states in the array of atoms coupled to photons propagating in a one-dimensional waveguide. We introduce a generalized many-body entropy of entanglement based on exact numerical diagonalization. We reveal the breakdown of fermionized subradiant states with increase of $f$ with emergence of short-ranged dimerized antiferromagnetic correlations.
  arXiv  Detail & Related papers  (2021-06-17T12:17:04Z)
• Different Types of Coherence: Young-type Interference versus Dicke Superradiance [0.0]
  We study the intensity distribution arising from two identical two-level atoms prepared either in an entangled Dicke state or in a separable atomic state with non-vanishing dipole moment. We find that the two configurations produce similar far field intensity patterns, however, stemming from fundamentally distinct types of coherence.
  arXiv  Detail & Related papers  (2021-05-11T09:29:10Z)
• Superradiance from non-ideal initial states -- a quantum trajectory approach [0.0]
  We investigate alternative initial states inducing a more complex time evolution. Superposition states of the fully inverted Dicke state and the Dicke ground state with unequal mutual weights are studied. Superradiance stemming from atoms in clusters separated by more than one wavelength is also studied.
  arXiv  Detail & Related papers  (2020-07-23T19:16:28Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.