Dynamical Decoupling of Open Quantum Systems

Dynamical Decoupling of Open Quantum Systems

11 Feb 1999 | Lorenza Viola1, Emanuel Knill2, and Seth Lloyd1 *
The authors propose a novel method to combat decoherence and dissipation in open quantum systems by filtering out unwanted system-environment interactions. They demonstrate that this noise-suppression procedure can be combined with control over the effective dynamical evolution of the system. The method involves using time-dependent perturbations to interfere with the system's dynamics, ensuring that the perturbations are faster than the relaxation timescale of the environment. The authors show that this approach can achieve both maximal and selective decoupling, depending on the available information about the system-bath interaction. They provide a theoretical framework and examples, such as a dissipative quantum register, to illustrate the effectiveness of their method. The key requirement for successful decoupling is that the induced motion must be faster than the fastest time scale of the unwanted interactions. The authors also discuss the practical feasibility of their approach, considering the relevant correlation times and available technologies.The authors propose a novel method to combat decoherence and dissipation in open quantum systems by filtering out unwanted system-environment interactions. They demonstrate that this noise-suppression procedure can be combined with control over the effective dynamical evolution of the system. The method involves using time-dependent perturbations to interfere with the system's dynamics, ensuring that the perturbations are faster than the relaxation timescale of the environment. The authors show that this approach can achieve both maximal and selective decoupling, depending on the available information about the system-bath interaction. They provide a theoretical framework and examples, such as a dissipative quantum register, to illustrate the effectiveness of their method. The key requirement for successful decoupling is that the induced motion must be faster than the fastest time scale of the unwanted interactions. The authors also discuss the practical feasibility of their approach, considering the relevant correlation times and available technologies.
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