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Scrambling of quantum information validated by quantum teleportation

The delocalization of information in interacting quantum systems seems to play a key part in their evolution. A method has been developed that could enable the dynamics of this process to be directly probed in experiments.
  1. Jonathan Home

    1. Jonathan Home is at the Institute for Quantum Electronics, Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.

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Quantum correlations that spread between parts of a many-body system are intrinsically linked to the system’s evolution towards thermal equilibrium, in a process called thermalization. Measuring these correlations is challenging, because of the need to filter relevant information from the huge amount that is present, without the measurement being mimicked or corrupted by the presence of noise. In a paper in Nature, Landsman et al.1 demonstrate that quantum teleportation of a single quantum bit (qubit) can provide direct evidence of dynamics that lead to correlations between all the components of a three-body system. This approach could be a powerful tool for characterizing future many-body quantum simulators — controllable quantum systems that can be used to model other quantum systems.

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Nature 567, 36-37 (2019)

doi: https://doi.org/10.1038/d41586-019-00743-4

References

  1. Landsman, K. A. et al. Nature 567, 61–65 (2019).

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  2. Swingle, B. & Yao, N. Y. Physics 10, 82 (2017).

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  3. Yoshida, B. & Kitaev, A. Preprint at https://arXiv.org/abs/1710.03363 (2017).

  4. Debnath, S. et al. Nature 536, 63–66 (2016).

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