Dynamical decoupling of a singlet-triplet qubit afflicted by a charge fluctuator

Article

关键词: SOLID-STATE SPIN;    QUANTUM-DOT;    DECOHERENCE;    COMPUTATION;   

DOI  :  10.1103/PhysRevB.86.125317

来源: SCIE

【 摘 要 】

The efficiency of dynamical decoupling pulse sequences in removing noise due to a nearby charge fluctuator is studied for a singlet-triplet spin qubit. We develop a numerical method to solve the dynamical equations for all three components of the Bloch vector under a general pulse protocol, where pulses are applied along an arbitrary rotation axis. The qubit is shown to undergo both dephasing and dissipative dynamics, pending on its working position. Analytical solutions are found for the limits of weakly and strongly coupled fluctuators, shedding light on the distinct dynamics in the different parameter regimes. Scaling of the qubit decay time with the number of control pulses is found to follow a power law over a wide range of parameters and qubit bias points.

【 授权许可】

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