TY - JOUR
T1 - Relaxation, dephasing, and quantum control of electron spins in double quantum dots
JF - Physical Review B
Y1 - 2007
A1 - J. M. Taylor
A1 - J. R. Petta
A1 - A. C. Johnson
A1 - A. Yacoby
A1 - C. M. Marcus
A1 - M. D. Lukin
AB - Recent experiments have demonstrated quantum manipulation of two-electron spin states in double quantum dots using electrically controlled exchange interactions. Here, we present a detailed theory for electron spin dynamics in two-electron double dot systems that was used to guide these experiments and analyze experimental results. The theory treats both charge and spin degrees of freedom on an equal basis. Specifically, we analyze the relaxation and dephasing mechanisms that are relevant to experiments and discuss practical approaches for quantum control of two-electron system. We show that both charge and spin dephasing play important roles in the dynamics of the two-spin system, but neither represents a fundamental limit for electrical control of spin degrees of freedom in semiconductor quantum bits.
VL - 76
UR - http://arxiv.org/abs/cond-mat/0602470v2
CP - 3
J1 - Phys. Rev. B
U5 - 10.1103/PhysRevB.76.035315
ER -