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

Abstract

The efficiency of dynamical decoupling pulse sequences in removing noise due to a 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, and with an arbitrary rotation axis. The qubit is shown to undergo both dephasing and dissipative dynamics, pending on its working point. 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 TLF parameters and qubit bias points.

17 pages, 11 figures

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Cited by in corpus (12)

• Environmental noise spectroscopy with qubits subjected to dynamical decoupling
• Dynamical decoupling noise spectroscopy at an optimal working point of a qubit
• Spin Relaxation due to Charge Noise
• Spectroscopy of cross-correlations of environmental noises with two qubits
• Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
• How to detect qubit-environment entanglement generated during qubit dephasing
• Trispectrum reconstruction of non-Gaussian noise
• Influence of nuclear spin polarization on spin echo signal of NV center qubit
• Non-Gaussian signatures and collective effects in charge noise affecting a dynamically-decoupled qubit
• Measuring trajectories of environmental noise
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots
• Qubit decoherence under two-axis coupling to low-frequency noises