Sensitivity of quantum information to environment perturbations measured with a non-local out-of-time-order correlation function

Understand

In a quantum system coupled with a non-Markovian environment, quantum information may flow out of or in to the system.

• Measuring quantum information flow and its sensitivity to perturbations is important for a better understanding of open quantum systems and for the implementation of quantum technologies.
• Information gets shared between a quantum system and its environment by means of system-environment correlations (SECs) that grow during their interaction.
• We design a nuclear magnetic resonance (NMR) experiment to directly observe the evolution of the SECs and use the second moment of their distribution as a natural metric for quantifying the flow of information.