Subradiance in a Large Cloud of Cold Atoms.

@article{Guerin2016SubradianceIA,
  title={Subradiance in a Large Cloud of Cold Atoms.},
  author={William Guerin and Michelle Oliveira de Araujo and Robin Kaiser},
  journal={Physical review letters},
  year={2016},
  volume={116 8},
  pages={
          083601
        }
}
Since Dicke's seminal paper on coherence in spontaneous radiation by atomic ensembles, superradiance has been extensively studied. Subradiance, on the contrary, has remained elusive, mainly because subradiant states are weakly coupled to the environment and are very sensitive to nonradiative decoherence processes. Here, we report the experimental observation of subradiance in an extended and dilute cold-atom sample containing a large number of particles. We use a far detuned laser to avoid… 

Figures from this paper

Subradiance in dilute atomic ensembles: Role of pairs and multiple scattering

We study numerically the slow (subradiant) decay of the fluorescence of motionless atoms after a weak pulsed excitation. We show that, in the linear-optics regime and for an excitation detuned by

Superradiance in a Large and Dilute Cloud of Cold Atoms in the Linear-Optics Regime.

TLDR
It is shown that, at large detuning, the decay rate of the off-axis fluorescence of a large and dilute cloud of cold rubidium atoms after the sudden switch off of a low-intensity laser driving the atomic transition increases with the on-resonance optical depth.

Subradiance in dilute atomic ensembles excited by nonresonant radiation

We numerically study the slow (subradiant) decay of the fluorescence of motionless atoms after a weak pulsed excitation. We show that, in the linear-optics regime and for an excitation detuned by

Subradiance and radiation trapping in cold atoms

We experimentally and numerically study the temporal dynamics of light scattered by large clouds of cold atoms after the exciting laser is switched off, in the low intensity (linear-optics) regime.

Subradiance and superradiance-to-subradiance transition in dilute atomic clouds

We experimentally study subradiance in a dilute cloud of ultracold rubidium (Rb) atoms where $n \lambda_a^3 \approx 10^{-2}$ ($n$: atomic density, $\lambda_a$ excitation wavelength) and the

Decay dynamics in the coupled-dipole model

Abstract Cooperative scattering in cold atoms has gained renewed interest, in particular in the context of single-photon superradiance, with the recent experimental observation of super- and

Dicke subradiance and thermal decoherence

Subradiance is the cooperative inhibition of the radiation by several emitters coupled to the same electromagnetic modes. It has been predicted by Dicke in 1954 and only recently observed in cold

van der Waals dephasing for Dicke subradiance in cold atomic clouds

We investigate numerically the role of near-field dipole-dipole interactions on the late emission dynamics of large disordered cold atomic samples driven by a weak field. Previous experimental and

Size dependence of single-photon superradiance of cold and dilute atomic ensembles

We report a theoretical investigation of angular distribution of a single-photon superradiance from cold and dilute atomic clouds. In the present work we focus our attention on the dependence of

Hyperradiance from collective behavior of coherently driven atoms

The collective behavior of ensembles of atoms has been studied in-depth since the seminal paper of Dicke [Phys. Rev.93, 99 (1954)PHRVAO0031-899X10.1103/PhysRev.93.99], where he demonstrated that a
...

References

SHOWING 1-10 OF 62 REFERENCES

Precise study of asymptotic physics with subradiant ultracold molecules

An experimental study characterizes subradiance—inhibited emission due to destructive interference—in ultracold molecules close to the dissociation limit and shows that it could be used for precision

Collective Lamb Shift in Single-Photon Superradiance

TLDR
It is shown that an ensemble of resonant atoms embedded in the center of a planar cavity can be collectively excited by synchrotron radiation into a purely superradiant state and the experimental technique provides a simple method for spectroscopic analysis of thesuperradiant emission.

The Super of Superradiance

TLDR
Cooperative single-photon emission from an atom ensemble will provide insights into quantum electrodynamics and applications in quantum communication and describe the cooperative, spontaneous emission of photons from a collection of atoms.

Cooperativity in light scattering by cold atoms

A cloud of cold N two‐level atoms driven by a resonant laser beam shows cooperative effects both in the scattered radiation field and in the radiation pressure force acting on the cloud

Superradiance and subradiance in an inhomogeneously broadened ensemble of two-level systems coupled to a low-Q cavity.

TLDR
An intrinsically bi-exponential emission dynamics is found when the time scales of superradiance tau(sr) and inhomogeneous dephasing T2* approximately 1/Deltaomega(inh) become comparable: a fast superradiant is followed by a slow subradiant decay.

Controlled Dicke subradiance from a large cloud of two-level systems.

TLDR
It is shown that a dilute cloud of cold atoms is an ideal system to look for subradiant states in free space and study various mechanisms to control this subradiance.

Cooperative spontaneous emission of N atoms: Many-body eigenstates, the effect of virtual Lamb shift processes, and analogy with radiation of N classical oscillators

We consider collective emission of a single photon from a cloud of $N$ two-level atoms (one excited, $N\ensuremath{-}1$ ground state). For a dense cloud the problem is reduced to finding

Classifying Superradiance in Extended Media

Single-photon superradiance is studied in a homogeneous, extended sample of two-level atoms in d = 1, 2, 3 dimensions. Based on a general functional form for the inter-atomic couplings, our

Radiation trapping in a cold atomic gas

We experimentally study radiation trapping of near-resonant light in a cloud of laser-cooled rubidium atoms. Unlike in most previous studies, dealing with hot vapors, collisional broadening is here
...