Fast spin state initialization in a singly charged InAs-GaAs quantum dot by optical cooling.
Quantum computation requires a continuous supply of rapidly initialized qubits for quantum error correction. Here, we demonstrate fast spin state initialization with near unity efficiency in a singly charged quantum dot by optically cooling an electron spin. The electron spin is successfully cooled from 5 to 0.06 K at a magnetic field of 0.88 T applied in Voigt geometry. The spin cooling rate is of order 10(9) s-1, which is set by the spontaneous decay rate of the excited state.
Xu
Xiaodong
X
The H.M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA.
Wu
Yanwen
Y
Sun
Bo
B
Huang
Qiong
Q
Cheng
Jun
J
Steel
D G
DG
Bracker
A S
AS
Gammon
D
D
Emary
C
C
Sham
L J
LJ