Charge relaxation in a single-electron Si/SiGe double quantum dot.
We measure the interdot charge relaxation time T1 of a single electron trapped in an accumulation mode Si/SiGe double quantum dot. The energy level structure of the charge qubit is determined using photon assisted tunneling, which reveals the presence of a low-lying excited state. We systematically measure T1 as a function of detuning and interdot tunnel coupling and show that it is tunable over four orders of magnitude, with a maximum of 45  μs for our device configuration.
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
K
K
Wang
C
C
Payette
Y
Y
Dovzhenko
P W
PW
Deelman
J R
JR
Petta