Efficient adaptive Bayesian estimation of a slowly fluctuating Overhauser field gradient

Understand

Slow fluctuations of Overhauser fields are an important source for decoherence in spin qubits hosted in III-V semiconductor quantum dots.

• Focusing on the effect of the field gradient on double-dot singlet-triplet qubits, we present two adaptive Bayesian schemes to estimate the magnitude of the gradient by a series of free induction decay experiments.
• We concentrate on reducing the computational overhead, with a real-time implementation of the schemes in mind.
• We show how it is possible to achieve a significant improvement of estimation accuracy compared to more traditional estimation methods.