Many strongly correlated quantum fluids exhibit universal transport properties, notably a famous quantum bound on the internal friction. In this talk I will discuss transport in a unitary Fermi gas: strong-coupling computations show that the shear viscosity, which determines friction, signals almost perfect fluidity in the quantum degenerate regime.  Similarly, spin diffusion becomes slower at strong interaction and reaches a quantum limit, in agreement with a recent experiment at MIT.  In the case of transverse spin diffusion the spin current will also precess around the local magnetization.  This Leggett-Rice effect has now been observed and provides new insight into the effective interaction in a unitary Fermi gas.

[1] Enss, Haussmann & Zwerger, Ann. Phys. 326, 770 (2011).
[2] Enss & Haussmann, Phys. Rev. Lett. 109, 195303 (2012).
[3] Bauer, Parish & Enss, Phys. Rev. Lett. 112, 135302 (2014).
[4] Trotzky, Beattie, Luciuk, Smale, Bardon, Enss, Taylor, Zhang &
Thywissen, Phys. Rev. Lett. 114, 015301 (2015).