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This study analytically extends continuous dynamical decoupling (CDD) strategies beyond longitudinal noise to effectively address transverse fluctuations and anisotropic inputs in generic qubit setups. By modeling control field ramps as noisy Landau-Zener transitions, the authors demonstrate that robust decoherence mitigation is achievable through optimized control parameters that reshape effective noise spectra. The work provides a practical framework for enhancing qubit stability in realistic environments where both dephasing and transverse noise are present.
Robust applicability of continuous dynamical decoupling to decoherence reduction in longitudinal and transverse-noise settings: The role of anisotropy
arXiv:2606.08114v1 Announce Type: new Abstract: We analytically evaluate the efficiency of continuous dynamical decoupling (CDD) to curb decoherence in generic qubit setups where diverse sources of noise can be present. Previous theoretical approaches to CDD have mainly focused on its potential to cope with longitudinal fluctuations. Here, the basic scenario tackled with CDD is generalized. Apart from dealing with pure dephasing induced by diagonal noise, we consider the impact of transverse fluctuations, usually present in the practical arrangements. In particular, the implications of anisotropic noisy inputs are studied. Additionally, we analyze the role of the fluctuations in the dressing of the qubit by the CDD field of control: since the driving field is usually switched on through linear ramps of its characteristic parameters, the associated dressing of the original states can be described in terms of noisy Landau-Zener transitions. In our approach, based on a sequence of unitary transformations, the noise entering the system is cast into effective stochastic terms whose spectral characteristics are dependent on the driving parameters. This description allows the design of strategies to mitigate the impact of the fluctuations using controlled changes in the effective-noise properties. Significant robustness of CDD against the generalization of the basic scenario can be achieved through an appropriate choice of the parameters of control.
Abstract:We analytically evaluate the efficiency of continuous dynamical decoupling (CDD) to curb decoherence in generic qubit setups where diverse sources of noise can be present. Previous theoretical approaches to CDD have mainly focused on its potential to cope with longitudinal fluctuations. Here, the basic scenario tackled with CDD is generalized. Apart from dealing with pure dephasing induced by diagonal noise, we consider the impact of transverse fluctuations, usually present in the practical arrangements. In particular, the implications of anisotropic noisy inputs are studied. Additionally, we analyze the role of the fluctuations in the dressing of the qubit by the CDD field of control: since the driving field is usually switched on through linear ramps of its characteristic parameters, the associated dressing of the original states can be described in terms of noisy Landau-Zener transitions. In our approach, based on a sequence of unitary transformations, the noise entering the system is cast into effective stochastic terms whose spectral characteristics are dependent on the driving parameters. This description allows the design of strategies to mitigate the impact of the fluctuations using controlled changes in the effective-noise properties. Significant robustness of CDD against the generalization of the basic scenario can be achieved through an appropriate choice of the parameters of control.
Quantum Physics (quant-ph); Applications (stat.AP)
arXiv:2606.08114 [quant-ph]
(or arXiv:2606.08114v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2606.08114 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
Phys. Rev. A 113, 062412 (2026)
https://doi.org/10.1103/gb82-y4z3 Focus to learn more DOI(s) linking to related resources
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