Long-lived quantum memory with nuclear atomic spins
  We propose to store non-classical states of light into the macroscopic collective nuclear spin ($10^{18}$ atoms) of a $^3$He vapor, using metastability exchange collisions. These collisions, commonly used to transfer orientation from the metastable state $2^{3}S\_1$ to the ground state state of $^3$He, can also transfer quantum correlations. This gives a possible experimental scheme to map a squeezed vacuum field state onto a nuclear spin state with very long storage times (hours). 
Aurelien Dantan (LKB - Jussieu), Gael Reinaudi (LKB - Lhomond), Alice   Sinatra (LKB - Lhomond), Franck Lalo\"e (LKB - Lhomo...