Single-shot measurement of triplet-singlet relaxation in a Si/SiGe   double quantum dot
  We investigate the lifetime of two-electron spin states in a few-electron Si/SiGe double dot. At the transition between the (1,1) and (0,2) charge occupations, Pauli spin blockade provides a readout mechanism for the spin state. We use the statistics of repeated single-shot measurements to extract the lifetimes of multiple states simultaneously. At zero magnetic field, we find that all three triplet states have equal lifetimes, as expected, and this time is ~10 ms. At non-zero field, the T0 lifetime is unchanged, whereas the T- lifetime increases monotonically with field, reaching 3 seconds at 1 T. 
J. R. Prance, Zhan Shi, C. B. Simmons, D. E. Savage, M. G. Lagally, L.   R. Schreiber, L. M. K. Vandersypen, Mark Friesen, R...
cond-mat.mes-hall