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Published on: May 30, 2014
Efficiently Characterizing the Quantum Information Flow, Loss, and Recovery in the Central Spin System
Jiahui Chen1,2, Mohamad Niknam3, David Cory1,4
1Institute for Quantum Computing, Waterloo, ON N2L 3G1, Canada.
Abstract:
Understanding the flow, loss, and recovery of the information between a system and its environment is essential for advancing quantum technologies. The central spin system serves as a useful model for a single qubit, offering valuable insights into how quantum systems can be manipulated and protected from decoherence. This work uses the stimulated echo experiment to track the information flow between the central spin and its environment, providing a direct measure of the sensitivity of system/environment correlations to environmental dynamics. The extent of mixing and the growth of correlations are quantified through autocorrelation functions of the noise and environmental dynamics, which also enable the estimation of nested commutators between the system/environment and environmental Hamiltonians. Complementary decoupling experiments offer a straightforward measure of the strength of the system Hamiltonians. The approach is experimentally demonstrated on a spin system.
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