Quantum Turbulent Structure in Light.

@article{Alperin2019QuantumTS,
  title={Quantum Turbulent Structure in Light.},
  author={Samuel N. Alperin and Abigail L. Grotelueschen and Mark E. Siemens},
  journal={Physical review letters},
  year={2019},
  volume={122 4},
  pages={
          044301
        }
}
The infinite superpositions of random plane waves are known to be threaded with vortex line singularities which form complicated tangles and obey strict topological rules. We observe that within these structures, a timelike axis appears to emerge with which we can define vortex velocities in a useful way: With both numerical simulations and optical experiments, we show that the statistics of these velocities match those of turbulent quantum fluids such as superfluid helium and atomic Bose… 

Figures from this paper

Superdiffusion of quantized vortices uncovering scaling behavior of quantum turbulence

Generic scaling laws, such as the Kolmogorov’s 5/3-law, are mile-stone achievements of turbulence research in classical fluids. For quantum fluids such as atomic Bose-Einstein condensates, superfluid

Structuring Light for Investigating Optical Vortices

Vortices are well known in our world: tornadoes, hurricanes, and quickly stirred iced tea all demonstrate the vortex phenomenon. In addition to these classical fluids, vortices exist in laser light.

Formation and dynamics of quantum hydrodynamical breathing-ring solitons

We show that exciton-polariton condensates may exhibit a fundamental, self-localized nonlinear excitation in quantum hydrodynamical systems, which takes the form of a dark ring-shaped breather. We

Superdiffusion of quantized vortices uncovering scaling laws in quantum turbulence

TLDR
An experiment where a tangle of vortices in superfluid 4He are decorated with solidified deuterium tracer particles results in an apparent superdiffusion of the vortice, and a previously unknown power-law scaling of the vortex–velocity temporal correlation is uncovered.

Optical vortex braiding with Bessel beams.

TLDR
The braiding of optical vortices in a laser beam with more than 2π rotation by superposing Bessel modes with a plane wave is proposed and how braiding can be controlled experimentally for any number of vortsices is discussed.

Speckled cross-spectral densities and their associated correlation singularities for a modern source of partially coherent x rays

We consider a realistic model for calculating the cross-spectral density of partially coherent beams from an x-ray undulator in a modern storage ring. This two-point coherence function is seen to

Measurement of Vortex Interactions in Light

We experimentally and theoretically study dynamics of a pair of point vortices in a large Gaussian laser beam. We observe annihilation of opposite charge optical vortices and characterize the effect

Optical Vortex Interactions Depend on Core Structure

We elucidate the impact of optical vortex structure on pair coupling and two-body dynamics. Vortices with hyperbolic tangent cross-sections are found to have reduced coupling strength as evidenced by

Directional dark-field implicit x-ray speckle tracking using an anisotropic-diffusion Fokker-Planck equation

When a macroscopic-sized non-crystalline sample is illuminated using coherent x-ray radiation, a bifurcation of photon energy flow may occur. The coarse-grained complex refractive index of the sample

X-ray phase-contrast imaging: a broad overview of some fundamentals

References

SHOWING 1-10 OF 50 REFERENCES

Coherent vortex structures in quantum turbulence

Quantum turbulence, easily generated in superfluid helium, consists of a disordered tangle of thin, discrete vortex lines of quantised circulation which move in a fluid without viscosity. In this

Statistics of Lagrangian quantum turbulence

We consider the dynamics of small tracer particles in turbulent quantum liquids. The complicated interaction processes of vortex filaments, the quantum constraints on vorticity and the varying

Vortex-density fluctuations in quantum turbulence

Turbulence in the low-temperature phase of liquid helium is a complex state in which a viscous normal fluid interacts with an inviscid superfluid. In the former vorticity consists of eddies of all

Nonclassical velocity statistics in a turbulent atomic Bose-Einstein condensate.

TLDR
Motivated by Paoletti's experiment, a small 3D turbulent state is created in an atomic Bose-Einstein condensate, the velocity field is computed directly, and similar nonclassical power-law tails are found, suggesting that non-Gaussian turbulent velocity statistics describe a fundamental property of quantum turbulence.

Quantum Turbulence in a Trapped Bose-Einstein Condensate under Combined Rotations around Three Axes

Abstract In this paper, we study quantum turbulence in trapped Bose-Einstein condensates by performing a numerical simulation of the Gross-Pitaevskii equation. Combining rotations around three axes,

Topology of light's darkness.

TLDR
The probability of a loop not being threaded decays exponentially with the length of the loop, which has a similarity to scaling laws studied in superfluid turbulence, and polymers modeled as random walks.

Velocity statistics distinguish quantum turbulence from classical turbulence.

By analyzing trajectories of solid hydrogen tracers, we find that the distributions of velocity in decaying quantum turbulence in superfluid 4He are strongly non-Gaussian with 1/v(3) power-law tails.

Polariton Superfluids Reveal Quantum Hydrodynamic Solitons

TLDR
Using an interacting Bose gas of exciton-polaritons in a semiconductor microcavity, the transition from superfluidity to the hydrodynamic formation of oblique dark solitons and vortex streets in the wake of a potential barrier is reported.

Persistence and Lifelong Fidelity of Phase Singularities in Optical Random Waves.

TLDR
This work studies the persistence and pairing statistics of phase singularities in random optical fields as a function of the excitation wavelength and demonstrates how such entities can encrypt fundamental properties of the random fields in which they arise.

Hydrodynamic nucleation of quantized vortex pairs in a polariton quantum fluid

Quantized vortices appear in quantum gases at the breakdown of superfluidity. In liquid helium and cold atomic gases, they have been indentified as the quantum counterpart of turbulence in classical