1. Ultracold gases Jami Kinnunen & Jani-Petri Martikainen Masterclass 2016

2. Radiation pressure: photon has wavevector q

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

4. Zeeman slower William Phillips

5. Finnish connection in the early years

6. Laser cooling: below Doppler limit??

7. Sisuphys cooling  Two linearly polarized laser beams with orthogonal polarizations interfere  polarization varies in space

8. Sisuphys cooling This could 400 nK + prefactor

9. Sisuphys cooling

10. Quantum statistics

11. Boltzmann, Bose-Einstein, Fermi-Dirac

12. 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.

13. Gross-Pitaevskii etc.

14. What to condense?

15. Bose-Einstein condensate: wavefunction?  What is it???

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

17. 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

18. Gross-Pitaevskii equation  Pure BEC governed by… This works very well in many realistic settings. Generalizations exist

19. Solid body rotation Impossible with a wavefunction?

20. Vortex: phase of the wavefunction

21. Vortex: higher “winding number”

22. How to get something like a classical solid body rotation?

23. Ongoing now: samples

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

25. Optical lattices

26. Slow light/light stopping https://www.youtube.com/watch?v=RIc5llW6 6sU

27. Can you swim in a superfluid

28. Swimming in a superfluid

31. Multicomponent swimmer

32. Quantum gas microscopes

33. Multicomponent systems  What are those?

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

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

36. Precision measurements  Clocks  Gravity  Acceleration

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

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