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Observation of superradiant Raman scattering in a Bose-Einstein condensate

Yutaka Yoshikawa, Toshiaki Sugiura, Yoshio Torii +1 more

We observed superradiant Raman scattering from a Bose-Einstein condensate irradiated by a single off-resonant light beam. Spontaneous mode selection of the scattered radiation turns probabilistic optical pumping into a stimulated Raman process, whereby the atoms are coherently transferred into a different hyperfine state. The population in the pumped state grew exponentially in time, demonstrating the emergence of bosonic stimulation in the optical pumping process.

Physical Review AApr 1, 200463 citations

Computational codes for simulating the Schr\"{o}dinger equation and the Master equation

Nagendra Dhakal, Michael Leuenberger

Bulletin of the American Physical SocietyMar 24, 20110 citations

Introduction to many-body perturbation theory calculations with the Yambo code

Enésio Marinho

May 2, 20260 citations

Temporal and spatial evolution of collision-induced stimulated effects in alkali atoms

Z. Konefał, Zygmunt Trumpakaj

A computational study of the optical propagation of Stokes light in a collisionally broadened three-level V-system Raman amplifier is presented. The Stokes light consists of two distinct spectral components: off-resonance stimulated Raman scattering and on-resonance stimulated fluorescence. These two signals are induced by collisional transfer of population from the excited state to the state. The intensity dependence of these effects on the buffer gas and intensity and detuning of the exciting radiations is calculated. In the calculations the probe signals and spontaneous scatterings were used to induce the stimulated signals. We have carried out the calculations over physically realistic propagation distances. The theory was compared with our experimental work and the results of the numerical analysis are used to explain some events observed in the experiments in which the physical mechanism has not yet been understood.A computational study of the optical propagation of Stokes light in a collisionally broadened three-level V-system Raman amplifier is presented. The Stokes light consists of two distinct spectral components: off-resonance stimulated Raman scattering and on-resonance stimulated fluorescence. These two signals are induced by collisional transfer of population from the excited state to the state. The intensity dependence of these effects on the buffer gas and intensity and detuning of the exciting radiations is calculated. In the calculations the probe signals and spontaneous scatterings were used to induce the stimulated signals. We have carried out the calculations over physically realistic propagation distances. The theory was compared with our experimental work and the results of the numerical analysis are used to explain some events observed in the experiments in which the physical mechanism has not yet been understood.

Journal of Physics B Atomic Molecular and Optical PhysicsJul 28, 19983 citations

Numerically optimized quantum error-correcting codes for a bosonic mode

Matti Silveri, Kari Mäkinen

APSJan 1, 20190 citations

Stimulated concentration (diffusion) light scattering on nanoparticles in a liquid suspension

I. S. Burkhanov, Светлана Владимировна Кривохижа, Leonid L. Chaikov

A nonlinear growth of the light scattering intensity has been observed and the frequency shift of the spectral line of scattered light has been measured in light backscattered in suspensions of diamond and latex nanoparticles in water. The shift corresponds to the HWHM of the line of spontaneous scattering on particles. We may conclude that there exists stimulated concentration (diffusion) light scattering on variations of the particle concentration, which is also called the stimulated Mie scattering. In a fibre probe scheme, the growth of the shift of the scattered spectral line is observed with an increase in the exciting beam power. The variation of the frequency shift with an increase in the exciting power is explained by convection in liquid.A nonlinear growth of the light scattering intensity has been observed and the frequency shift of the spectral line of scattered light has been measured in light backscattered in suspensions of diamond and latex nanoparticles in water. The shift corresponds to the HWHM of the line of spontaneous scattering on particles. We may conclude that there exists stimulated concentration (diffusion) light scattering on variations of the particle concentration, which is also called the stimulated Mie scattering. In a fibre probe scheme, the growth of the shift of the scattered spectral line is observed with an increase in the exciting beam power. The variation of the frequency shift with an increase in the exciting power is explained by convection in liquid.

Quantum ElectronicsJun 6, 20166 citations

Code for calculations in "Observation of bosonic stimulation in light scattering" (arXiv:2204.06639)

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Code for calculations in "Observation of bosonic stimulation in light scattering" (arXiv:2204.06639)

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