# Quantum kinetics of refocusing

Source: [Quantum kinetics of refocusing](<https://www.sota2.com/research/paper/68fa20057a2b558e2932e176>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-23T20:36:06.504Z

Authors: Leonid P. Pryadko, Pinaki Sengupta

Published: 2005-09-30T22:44:51.000Z

## Abstract

We consider quantum kinetics of an open quantum system in the presence of periodic fields designed to suppress the internal evolution and shield the system from generic low-frequency environment (refocusing or dynamical decoupling in application to multi-qubit systems). Assuming that the refocusing has order K, that is, for frozen environment the cumulant expansion of the evolution operator over the period tau begins with the term ~tau^(K+1), we trace the associated cancellations in the kernel of the quantum kinetic equation in the Floquet formalism and characterize the remaining decoherence processes.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/quant-ph/0510001>)

[PDF](<https://arxiv.org/pdf/quant-ph/0510001.pdf>)