Ultracold gases Jami Kinnunen JaniPetri Martikainen Masterclass 2016

Radiation pressure: photon has wavevector q

Zeeman slower Change the resonance frequency along the way as atoms are cooled by

Sisuphys cooling Two linearly polarized laser beams with orthogonal polarizations interfere polarization varies in

Sisuphys cooling This could 400 n. K+ prefactor

Interesting points BE gives higher occupations for small energies FD gives lower occupations for

Bose-Einstein condensate: wavefunction? What is it? ? ?

Interactions: scattering length Contact interaction… Billiard ball with radius “a” That is a lie:

Dilute/weak interactions What does it mean? Gas of billiard balls at density n is

Gross-Pitaevskii equation Pure BEC governed by… tings. t e s c i t s

Solid body rotation Impossible with a wavefunction?

How to get something like a classical solid body rotation?

Ultracold fermions Image: Moritz group, Hamburg Harder or easier than bosons?

Slow light/light stopping https: //www. youtube. com/watch? v=RIc 5 ll. W 66 s. U

M ul tic om po ne nt sw im m er Swimming in a

Strongly interacting systems: beyond mean-field Bye bye Gross-Pitaevskii Weak to strong coupling transitions Effective

Throw the BEC from 146 m tower Because…why not!

Precision measurements Clocks Gravity Acceleration

Long range interactions Beyond billiard balls Erbium magnetic dipole moment of 7 μB

Quantum information Maybe a platform for some QI approaches? Easy to get carried away

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Ultracold gases Jami Kinnunen & Jani-Petri Martikainen Masterclass 2016

Radiation pressure: photon has wavevector q

Zeeman slower Change the resonance frequency along the way as atoms are cooled by radiation pressure…

Zeeman slower William Phillips

Finnish connection in the early years

Laser cooling: below Doppler limit? ?

Sisuphys cooling Two linearly polarized laser beams with orthogonal polarizations interfere polarization varies in space

Sisuphys cooling This could 400 n. K+ prefactor

Sisuphys cooling

Quantum statistics

Boltzmann, Bose-Einstein, Fermi. Dirac

Interesting points BE gives higher occupations for small energies FD gives lower occupations for small energies (n=1 upper limit) Derivation is kind of cleaner and more elegant for bosons and fermions…classical result is more of a mess.

Gross-Pitaevskii etc.

What to condense?

Bose-Einstein condensate: wavefunction? What is it? ? ?

Interactions: scattering length Contact interaction… Billiard ball with radius “a” That is a lie: complications exist

Dilute/weak interactions What does it mean? Gas of billiard balls at density n is dilute if…? Check this for ultracold cloud of Rb atoms Liquid helium

Gross-Pitaevskii equation Pure BEC governed by… tings. t e s c i t s i ny real a m n i l l very we s k r o w This xist e s n o i t a iz General

Solid body rotation Impossible with a wavefunction?

Vortex: phase of the wavefunction

Vortex: higher “winding number”

How to get something like a classical solid body rotation?

Ongoing now: samples

Ultracold fermions Image: Moritz group, Hamburg Harder or easier than bosons?

Optical lattices

Slow light/light stopping https: //www. youtube. com/watch? v=RIc 5 ll. W 66 s. U

Can you swim in a superfluid

Swimming in a superfluid

M ul tic om po ne nt sw im m er Swimming in a superfluid

Quantum gas microscopes

Multicomponent systems What are those?

Strongly interacting systems: beyond mean-field Bye bye Gross-Pitaevskii Weak to strong coupling transitions Effective spin model

Throw the BEC from 146 m tower Because…why not!

Precision measurements Clocks Gravity Acceleration

Long range interactions Beyond billiard balls Erbium magnetic dipole moment of 7 μB

Quantum information Maybe a platform for some QI approaches? Easy to get carried away with this though…buzzword